ok so my i just upgraded my desktop from win 7 - win 8.1 ( gaming reasons) my fsx crashes it doesnt happen on win 7. ok so here's what happened:

 

1st flight: RPLL - OMDB

 

so before approach i want to see dubai clearly so i've changed the time then after 1-3 mins my sim crash.

 

2nd flight : RPLL - OMDB

 

same step to make sure that it's just not a glitch. it crashes again

 

3rd flight : RPLL - OMDB

 

this time i didnt change the time. it didn't crash wow.

 

4th flight:

 

same step. it didn't crash 

 

5th flight ( w/ sim rate )

 

same step as 1st - 2nd flight. well it crash

 

6th flight (w/ sim rate )

 

same step as 3rd - 4th. i didnt crash.

 

 

 

so guys any idea why is it happening on 8.1 i've done this steps on win 7 many times but my sim didn't crash/

 

You should post an AppCrashView report here (see AVSIM CTD Guide located to the right of this forum under Hot Spots).

Most likely you are running out of Virtual Address Space (VAS) as the flight is over 7 hours. If you have high fsx/display driver settings, you will run out of VAS after a long flight. Lower your settings is one option. More info can be found in the AVSIM CTD Guide about VAS. More info here:

Monitoring VAS in FSX or P3DV2 – The freeware or registered versions of the FSUIPC utility will allow you to monitor the amount of VAS remaining during a flight session. This might be valuable in troubleshooting Out-of-Memory (OOM’s).

Startup FSX/P3D and then enter the Addon Menu and select FSUIPC. Once FSUIPC is open, click on the Logging Tab and enter 024C under Offset and select S32 under Type. Select where you would like to have the usage displayed. The FS Window is for Full Screen sessions. The FS Title Bar is for Windowed Mode. AVSIM recommends you also check the Normal log file as this provides you information on how much VAS you had to start out with and then it logs usage throughout your flight.

The VAS usage is displayed in Kilobytes (KB’s). The value represents the amount of VAS left so, the lower the value, the more VAS being depleted. The max amount of VAS allowed in computers with 64 bit Operating Systems is 4GB’s. This is shared with other applications running in the background on your computer. For 32 bit Operating Systems, the max amount of VAS allowed for FSX/P3D is 2GB’s but this can be expanded to 3GB’s with a switch like the /3GB switch.

To convert the KB’s to the amount of GB’s, you should use one of the Byte converters on the Internet like the following: http://www.whatsabyte.com/P1/byteconverter.htm. You will never see 4194304 KB’s displayed as this equals 4GB’s. You might see around 3GB’s (3145728) remaining when you first start up FSX/P3D but that would be unusual. Do not be too concerned with the amount of VAS remaining when you first start up.

You might be interested in a utility in our AVSIM Library called Quantum Leap which allows you to speed up your trip across the US or any ocean but it requires the payware version of the FSUIPC utility - http://library.avsim...php?DLID=179703. According to the developer, “this utility was written to allow an FSX aircraft established at cruise to "leap" to a point further along the flight plan track. It allows the user to select a nav fix or manually enter coordinates for the jump-ahead point, as well as setting a new time in the simulation to be set at the designated leap-ahead point. The primary objective was to leap forward on very long haul flights to eliminate long periods of droning or wrestling with accelerated flight. It was tested with the PMDG® 777 and 737NGX simulations, but will most likely work with most other add-ons.”

Best regards,