After a 4 hour flight i switched on the dome light and it crashed straight to the desktop with no Prepar3D has stopped working. No report in the event viewer or the appcrash!

 

Not sure why this has happened? Bad install of the 737 NGX ?

Most likely you ran out of VAS.  When you run out of VAS (an OOM), there may or may not be an error message.   Any flights over 4 hours take up an enormous amount of virtual memory and, when descending or landing, you will begin to run out of memory.  There is no fix for this problem with P3D, FSX, or FSX-SE.  I monitor my VAS usage using the FSUIPC utility where I can watch how much VAS has been used throughout the flight.  If I am starting to run low on VAS, I will usually turn off things I don't need like ASN or MyTraffic6 and also turn down my P3D settings.  Sometimes this will work.  Sometimes not.  I would not recommend anyone taking a 4 hour plus flight in P3D, FSX, or FSX-SE as most likely you will be extremely disappointed when you get a crash. I keep all of my flights to 2 hours or less and, even so, I see a dramatic decrease in VAS when descending into a commercial addon airport.

 

Best regards,

Hi jim thats strange because i've been running P3D since last sept when i got it with over 4 hour flights. I just done a reinstall of windows 7 and P3D. Only got the NGX, ASN and FTX global base. And no MT 6 because i only use vatsim for MT 6. I've had way more addon airports on my last install before this reinstall. My settings are low 1024 textures etc. I run nothing crazy!

 

It was only when i switched on the dome light it crashed. I believe other users are suffering this over at PMDG forum as i just found out. But i will install that VAS FSUIPC thing