So a few months ago I started using DX12 and swapped to DLSS4 using the swapper tool and the required nvidia inspector settings. After some usage time i found out that DX12 in MSFS has memory leak issues. I will attach a screenshot for anyone who doesnt believe me. This was after a longer flight in the FBW A380, i already use the downscaled textures for this aircraft which are available on flightsim.to. My system is mid-range-well equipped with RAM and VRAM, and it still manages to overload it completely after a few hours while FPS are fine when starting up the sim.

 

But this is not the issue i am trying to get solved, its just the reason why I want to actually switch back to DX11 but I cant. MSFS in DX11 mode crashes after the initial loading when usually the main menu should be shown but instead i am getting a CTD. I dont know if this issue is related to DLSS4 or not. For safety I aleady switched back to default in the DLSS swapper utility with no change.
Here is the corresponding error log from windows:

 

Fehlerhafter Anwendungsname: FlightSimulator.exe, Version: 1.39.9.0, Zeitstempel: 0x00000000
Fehlerhafter Modulname: nvngx_dlssg.dll_unloaded, Version: 310.2.1.0, Zeitstempel: 0x67d089b2
Ausnahmecode: 0xc0000005
Fehleroffset: 0x00000000008976a0
Fehlerhafte Prozess-ID: 0x184C
Fehlerhafte Anwendungsstartzeit: 0x1DC25BFC6761C99
Fehlerhafter Anwendungspfad: C:\Program Files\WindowsApps\Microsoft.FlightSimulator_1.39.9.0_x64__8wekyb3d8bbwe\FlightSimulator.exe
Fehlerhafter Modulpfad: nvngx_dlssg.dll
Berichts-ID: 1b6bf1d2-831c-4d6e-adee-5d331708647d
Vollständiger Name des fehlerhaften Pakets: Microsoft.FlightSimulator_1.39.9.0_x64__8wekyb3d8bbwe
Fehlerhafte paketbezogene Anwendungs-ID: App

It seems to be an nvidia driver issue. I found some reports of similar issues with latest nvidia drivers and nvidia releasing a hotfix, but on my system the problem still persists with the latest nvidia drivers 581.29.
I already dumped the nvidia app from my system as some say this could cause issues and there is no benefit of having it if you use nvidia inspector. 
GPU is a 4060ti with 16GB VRAM on windows 11.

Has anyone dug into that issue with more success than I did?

UPDATE: it seems that the crash doesnt happen when Hardware Accelerated GPU Scheduling is turned off in windows settings. However, DLSS4 definitely doesnt work in DX11, since it crashes as soon as you try to load a flight. DX11 with TAA works, however.
 

Edited September 25, 2025Sep 25 by Soulflight

post can be deleted by now.

This was resolved with the 16.1 update in 2020.