Anyone care to look in their Windows event log for app crash/es similar to the following below entries...(they were all back to back during a run of MSFS2020) but I also see same ones when I run 2024. They however do not crash either sim at all. I posted over on the FSDT forum and Umberto replied the following:

"The error seems to indicate a problem with .NET, which is quite strange, since the Couatl64 .exe is NOT a .NET app, it's a native x64 app that doesn't do any call to the .NET framework. So, I wonder if this might be something else entirely, like another app (antivirus, maybe) that DOES use .NET and attaches to the Couatl64.exe, which is what antivirus usually do to check."

I have the antivirus (Avast Free Edition) set to exclude the FSDT Addon manager folder. I also ran the .NET repair tool with success. Also ran several DISM.exe commands with success. Running Windows 11 Home 25H2 26200.7019

 

Log Name:      Application
Source:        .NET Runtime
Date:          11/6/2025 3:10:37 PM
Event ID:      1023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      DESKTOP-AFGL0LD
Description:
Application: Couatl64_MSFS.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FF8DE52657C (00007FF8DE520000) with exit code 80131506.

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name=".NET Runtime" />
    <EventID Qualifiers="0">1023</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2025-11-06T23:10:37.1019076Z" />
    <EventRecordID>80446</EventRecordID>
    <Correlation />
    <Execution ProcessID="12576" ThreadID="0" />
    <Channel>Application</Channel>
    <Computer>DESKTOP-AFGL0LD</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Application: Couatl64_MSFS.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FF8DE52657C (00007FF8DE520000) with exit code 80131506.
</Data>
  </EventData>
</Event>

 

 

Log Name:      Application
Source:        Application Error
Date:          11/6/2025 3:10:37 PM
Event ID:      1000
Task Category: Application Crashing Events
Level:         Error
Keywords:      
User:          DESKTOP-AFGL0LD\usnao
Computer:      DESKTOP-AFGL0LD
Description:
Faulting application name: Couatl64_MSFS.exe, version: 5.0.0.6021, time stamp: 0x68a72d98
Faulting module name: clr.dll, version: 4.8.9323.0, time stamp: 0x68c9b9f3
Exception code: 0xc0000005
Fault offset: 0x000000000000657c
Faulting process id: 0x3120
Faulting application start time: 0x1DC4F70A53110C7
Faulting application path: C:\Program Files (x86)\Addon Manager\couatl64\Couatl64_MSFS.exe
Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
Report Id: f2e6b785-e257-4008-87f5-143703351bf3
Faulting package full name: 
Faulting package-relative application ID: 
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" Guid="{a0e9b465-b939-57d7-b27d-95d8e925ff57}" />
    <EventID>1000</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>100</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2025-11-06T23:10:37.3500634Z" />
    <EventRecordID>80447</EventRecordID>
    <Correlation />
    <Execution ProcessID="9572" ThreadID="17784" />
    <Channel>Application</Channel>
    <Computer>DESKTOP-AFGL0LD</Computer>
    <Security UserID="S-1-5-21-2400603791-3703659137-366786281-1002" />
  </System>
  <EventData>
    <Data Name="AppName">Couatl64_MSFS.exe</Data>
    <Data Name="AppVersion">5.0.0.6021</Data>
    <Data Name="AppTimeStamp">68a72d98</Data>
    <Data Name="ModuleName">clr.dll</Data>
    <Data Name="ModuleVersion">4.8.9323.0</Data>
    <Data Name="ModuleTimeStamp">68c9b9f3</Data>
    <Data Name="ExceptionCode">c0000005</Data>
    <Data Name="FaultingOffset">000000000000657c</Data>
    <Data Name="ProcessId">0x3120</Data>
    <Data Name="ProcessCreationTime">0x1dc4f70a53110c7</Data>
    <Data Name="AppPath">C:\Program Files (x86)\Addon Manager\couatl64\Couatl64_MSFS.exe</Data>
    <Data Name="ModulePath">C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll</Data>
    <Data Name="IntegratorReportId">f2e6b785-e257-4008-87f5-143703351bf3</Data>
    <Data Name="PackageFullName">
    </Data>
    <Data Name="PackageRelativeAppId">
    </Data>
  </EventData>
</Event>

 

 

Log Name:      Application
Source:        Windows Error Reporting
Date:          11/6/2025 3:10:40 PM
Event ID:      1001
Task Category: None
Level:         Information
Keywords:      
User:          DESKTOP-AFGL0LD\usnao
Computer:      DESKTOP-AFGL0LD
Description:
Fault bucket 1855057619941125242, type 4
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: Couatl64_MSFS.exe
P2: 5.0.0.6021
P3: 68a72d98
P4: clr.dll
P5: 4.8.9323.0
P6: 68c9b9f3
P7: c0000005
P8: 000000000000657c
P9: 
P10: 

Attached files:
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.3b130b71-62a2-40c4-8c5f-d9262121de3a.tmp.mdmp
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.0d584ef1-5e2f-4089-afbb-4aa0f4652b75.tmp.WERInternalMetadata.xml
WPR_initiated_DiagTrackMiniLogger_OneTrace_User_Logger_20251104_1_EC_0_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.d089955e-4ab4-46fb-b764-01d4423548ae.tmp.etl
WPR_initiated_DiagTrackMiniLogger_WPR System Collector_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f1d5e811-db63-4dc5-a472-baf81dc04dde.tmp.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.9c9a0ad8-1626-41fe-af40-c1987c587b3c.tmp.csv
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.c52239b5-a791-4a06-abac-83463bc62aea.tmp.txt
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.7969feb8-3c73-40be-b4bd-9979c6739118.tmp.xml

These files may be available here:
\\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_Couatl64_MSFS.ex_863aa1dbf6c84a99b9cfa21b36c021c08044527e_21333e8e_365ae12c-587f-44f9-b1f9-cc37ae35fd71

Analysis symbol: 
Rechecking for solution: 0
Report Id: f2e6b785-e257-4008-87f5-143703351bf3
Report Status: 268435456
Hashed bucket: b4303b7ade0dfc0789be7d13aa78ec7a
Cab Guid: 0
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Windows Error Reporting" Guid="{0ead09bd-2157-539a-8d6d-c87f95b64d70}" />
    <EventID>1001</EventID>
    <Version>0</Version>
    <Level>4</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2025-11-06T23:10:40.6773183Z" />
    <EventRecordID>80448</EventRecordID>
    <Correlation />
    <Execution ProcessID="9572" ThreadID="17784" />
    <Channel>Application</Channel>
    <Computer>DESKTOP-AFGL0LD</Computer>
    <Security UserID="S-1-5-21-2400603791-3703659137-366786281-1002" />
  </System>
  <EventData>
    <Data Name="Bucket">1855057619941125242</Data>
    <Data Name="BucketType">4</Data>
    <Data Name="EventName">APPCRASH</Data>
    <Data Name="Response">Not available</Data>
    <Data Name="CabId">0</Data>
    <Data Name="P1">Couatl64_MSFS.exe</Data>
    <Data Name="P2">5.0.0.6021</Data>
    <Data Name="P3">68a72d98</Data>
    <Data Name="P4">clr.dll</Data>
    <Data Name="P5">4.8.9323.0</Data>
    <Data Name="P6">68c9b9f3</Data>
    <Data Name="P7">c0000005</Data>
    <Data Name="P8">000000000000657c</Data>
    <Data Name="P9">
    </Data>
    <Data Name="P10">
    </Data>
    <Data Name="AttachedFiles">
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.3b130b71-62a2-40c4-8c5f-d9262121de3a.tmp.mdmp
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.0d584ef1-5e2f-4089-afbb-4aa0f4652b75.tmp.WERInternalMetadata.xml
WPR_initiated_DiagTrackMiniLogger_OneTrace_User_Logger_20251104_1_EC_0_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.d089955e-4ab4-46fb-b764-01d4423548ae.tmp.etl
WPR_initiated_DiagTrackMiniLogger_WPR System Collector_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f1d5e811-db63-4dc5-a472-baf81dc04dde.tmp.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.9c9a0ad8-1626-41fe-af40-c1987c587b3c.tmp.csv
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.c52239b5-a791-4a06-abac-83463bc62aea.tmp.txt
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.7969feb8-3c73-40be-b4bd-9979c6739118.tmp.xml</Data>
    <Data Name="StorePath">\\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_Couatl64_MSFS.ex_863aa1dbf6c84a99b9cfa21b36c021c08044527e_21333e8e_365ae12c-587f-44f9-b1f9-cc37ae35fd71</Data>
    <Data Name="AnalysisSymbol">
    </Data>
    <Data Name="Rechecking">0</Data>
    <Data Name="ReportId">f2e6b785-e257-4008-87f5-143703351bf3</Data>
    <Data Name="ReportStatus">268435456</Data>
    <Data Name="HashedBucket">b4303b7ade0dfc0789be7d13aa78ec7a</Data>
    <Data Name="CabGuid">0</Data>
  </EventData>
</Event>

 

 

Log Name:      Application
Source:        .NET Runtime
Date:          11/6/2025 3:12:16 PM
Event ID:      1023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      DESKTOP-AFGL0LD
Description:
Application: Couatl64_MSFS.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FF8DE52657C (00007FF8DE520000) with exit code 80131506.

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name=".NET Runtime" />
    <EventID Qualifiers="0">1023</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2025-11-06T23:12:16.1933141Z" />
    <EventRecordID>80449</EventRecordID>
    <Correlation />
    <Execution ProcessID="12072" ThreadID="0" />
    <Channel>Application</Channel>
    <Computer>DESKTOP-AFGL0LD</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Application: Couatl64_MSFS.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FF8DE52657C (00007FF8DE520000) with exit code 80131506.
</Data>
  </EventData>
</Event>

 

 

Log Name:      Application
Source:        Application Error
Date:          11/6/2025 3:12:16 PM
Event ID:      1000
Task Category: Application Crashing Events
Level:         Error
Keywords:      
User:          DESKTOP-AFGL0LD\usnao
Computer:      DESKTOP-AFGL0LD
Description:
Faulting application name: Couatl64_MSFS.exe, version: 5.0.0.6021, time stamp: 0x68a72d98
Faulting module name: clr.dll, version: 4.8.9323.0, time stamp: 0x68c9b9f3
Exception code: 0xc0000005
Fault offset: 0x000000000000657c
Faulting process id: 0x2F28
Faulting application start time: 0x1DC4F729A087C93
Faulting application path: C:\Program Files (x86)\Addon Manager\couatl64\Couatl64_MSFS.exe
Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
Report Id: 0936cc94-a540-44ed-8cda-d8b7f029e348
Faulting package full name: 
Faulting package-relative application ID: 
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" Guid="{a0e9b465-b939-57d7-b27d-95d8e925ff57}" />
    <EventID>1000</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>100</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2025-11-06T23:12:16.3914704Z" />
    <EventRecordID>80450</EventRecordID>
    <Correlation />
    <Execution ProcessID="9880" ThreadID="7928" />
    <Channel>Application</Channel>
    <Computer>DESKTOP-AFGL0LD</Computer>
    <Security UserID="S-1-5-21-2400603791-3703659137-366786281-1002" />
  </System>
  <EventData>
    <Data Name="AppName">Couatl64_MSFS.exe</Data>
    <Data Name="AppVersion">5.0.0.6021</Data>
    <Data Name="AppTimeStamp">68a72d98</Data>
    <Data Name="ModuleName">clr.dll</Data>
    <Data Name="ModuleVersion">4.8.9323.0</Data>
    <Data Name="ModuleTimeStamp">68c9b9f3</Data>
    <Data Name="ExceptionCode">c0000005</Data>
    <Data Name="FaultingOffset">000000000000657c</Data>
    <Data Name="ProcessId">0x2f28</Data>
    <Data Name="ProcessCreationTime">0x1dc4f729a087c93</Data>
    <Data Name="AppPath">C:\Program Files (x86)\Addon Manager\couatl64\Couatl64_MSFS.exe</Data>
    <Data Name="ModulePath">C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll</Data>
    <Data Name="IntegratorReportId">0936cc94-a540-44ed-8cda-d8b7f029e348</Data>
    <Data Name="PackageFullName">
    </Data>
    <Data Name="PackageRelativeAppId">
    </Data>
  </EventData>
</Event>

 

 

Log Name:      Application
Source:        Windows Error Reporting
Date:          11/6/2025 3:12:19 PM
Event ID:      1001
Task Category: None
Level:         Information
Keywords:      
User:          DESKTOP-AFGL0LD\usnao
Computer:      DESKTOP-AFGL0LD
Description:
Fault bucket 1855057619941125242, type 4
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: Couatl64_MSFS.exe
P2: 5.0.0.6021
P3: 68a72d98
P4: clr.dll
P5: 4.8.9323.0
P6: 68c9b9f3
P7: c0000005
P8: 000000000000657c
P9: 
P10: 

Attached files:
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f77794f0-ee21-4fd8-ac34-e861218dc212.tmp.mdmp
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.8d05d7a3-d085-4c48-8d34-78d2e4f197c8.tmp.WERInternalMetadata.xml
WPR_initiated_DiagTrackMiniLogger_OneTrace_User_Logger_20251104_1_EC_0_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.7e539a19-6303-4d91-ada7-4e7b97de78c4.tmp.etl
WPR_initiated_DiagTrackMiniLogger_WPR System Collector_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.4bf7433a-c1f7-4470-ade2-b6cad7a0001c.tmp.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.401f762a-b05e-4c52-aa14-6eb0450e3800.tmp.csv
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f9efb9ad-f5f1-4cba-bab4-0712f7854719.tmp.txt
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.14c467f1-c3c3-4007-8e38-831c680a48a8.tmp.xml

These files may be available here:
\\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_Couatl64_MSFS.ex_863aa1dbf6c84a99b9cfa21b36c021c08044527e_21333e8e_1e4b422b-a0e8-4241-bcef-fc2af31bb8d2

Analysis symbol: 
Rechecking for solution: 0
Report Id: 0936cc94-a540-44ed-8cda-d8b7f029e348
Report Status: 268435456
Hashed bucket: b4303b7ade0dfc0789be7d13aa78ec7a
Cab Guid: 0
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Windows Error Reporting" Guid="{0ead09bd-2157-539a-8d6d-c87f95b64d70}" />
    <EventID>1001</EventID>
    <Version>0</Version>
    <Level>4</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2025-11-06T23:12:19.6697072Z" />
    <EventRecordID>80451</EventRecordID>
    <Correlation />
    <Execution ProcessID="9880" ThreadID="7928" />
    <Channel>Application</Channel>
    <Computer>DESKTOP-AFGL0LD</Computer>
    <Security UserID="S-1-5-21-2400603791-3703659137-366786281-1002" />
  </System>
  <EventData>
    <Data Name="Bucket">1855057619941125242</Data>
    <Data Name="BucketType">4</Data>
    <Data Name="EventName">APPCRASH</Data>
    <Data Name="Response">Not available</Data>
    <Data Name="CabId">0</Data>
    <Data Name="P1">Couatl64_MSFS.exe</Data>
    <Data Name="P2">5.0.0.6021</Data>
    <Data Name="P3">68a72d98</Data>
    <Data Name="P4">clr.dll</Data>
    <Data Name="P5">4.8.9323.0</Data>
    <Data Name="P6">68c9b9f3</Data>
    <Data Name="P7">c0000005</Data>
    <Data Name="P8">000000000000657c</Data>
    <Data Name="P9">
    </Data>
    <Data Name="P10">
    </Data>
    <Data Name="AttachedFiles">
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f77794f0-ee21-4fd8-ac34-e861218dc212.tmp.mdmp
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.8d05d7a3-d085-4c48-8d34-78d2e4f197c8.tmp.WERInternalMetadata.xml
WPR_initiated_DiagTrackMiniLogger_OneTrace_User_Logger_20251104_1_EC_0_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.7e539a19-6303-4d91-ada7-4e7b97de78c4.tmp.etl
WPR_initiated_DiagTrackMiniLogger_WPR System Collector_inject.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.4bf7433a-c1f7-4470-ade2-b6cad7a0001c.tmp.etl
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.401f762a-b05e-4c52-aa14-6eb0450e3800.tmp.csv
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f9efb9ad-f5f1-4cba-bab4-0712f7854719.tmp.txt
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.14c467f1-c3c3-4007-8e38-831c680a48a8.tmp.xml</Data>
    <Data Name="StorePath">\\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_Couatl64_MSFS.ex_863aa1dbf6c84a99b9cfa21b36c021c08044527e_21333e8e_1e4b422b-a0e8-4241-bcef-fc2af31bb8d2</Data>
    <Data Name="AnalysisSymbol">
    </Data>
    <Data Name="Rechecking">0</Data>
    <Data Name="ReportId">0936cc94-a540-44ed-8cda-d8b7f029e348</Data>
    <Data Name="ReportStatus">268435456</Data>
    <Data Name="HashedBucket">b4303b7ade0dfc0789be7d13aa78ec7a</Data>
    <Data Name="CabGuid">0</Data>
  </EventData>
</Event>

 

 

Log Name:      Application
Source:        .NET Runtime
Date:          11/6/2025 3:16:56 PM
Event ID:      1023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      DESKTOP-AFGL0LD
Description:
Application: Couatl64_MSFS.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FF8DE52657C (00007FF8DE520000) with exit code 80131506.

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name=".NET Runtime" />
    <EventID Qualifiers="0">1023</EventID>
    <Version>0</Version>
    <Level>2</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2025-11-06T23:16:56.3341830Z" />
    <EventRecordID>80452</EventRecordID>
    <Correlation />
    <Execution ProcessID="9144" ThreadID="0" />
    <Channel>Application</Channel>
    <Computer>DESKTOP-AFGL0LD</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Application: Couatl64_MSFS.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP 00007FF8DE52657C (00007FF8DE520000) with exit code 80131506.
</Data>
  </EventData>
</Event>

Edited November 7, 2025Nov 7 by udidwht

Did you try adding Couatl64_MSFS.exe as an app exclusion in AVAST?

3 hours ago, somiller said:

Did you try adding Couatl64_MSFS.exe as an app exclusion in AVAST?

Did that. Same results.

Not specific to this issue but have you tried downloading the latest FSDT Universal Installer from FSDT and running that? It solved some of the GSX issues I was having.