[vic365]

After much digging I still think it's an overzealous GPU overclock. What is throwing me off is Full Screen mode. Used to be, in Windowed, I would get an "We are sorry but FS9..." error message, telling you what, generally the problem was (Out Of Memory, Terrain.DLL,etc.) and only hardware issues would lock it up tight and send the sound into a loop. Now that I have to fly Full Screen, I don't have the error message to direct me...if anything causes FS9 to shut down, it just locks up. I did a flight, a while back, with no GPU OC and it locked up. I then assumed that this indicated that my OC'ing was not the original cause of the problem as I wasn't using any on that flight and it still went toes up. I now believe the issue was scenery related on that particular flight and it would have locked up with or without graphics OC'ing. I went back to my usual OC and have the lock-ups return with no scenery, texture or terrain issues found in FSManager.

I am in my 2nd flight with no OC and, so far, no problems. If I can get 15 - 20 flights with no lockups then I will consider that proof that my GPU OC was too..."strenuous"...and will start raising it much more conservatively.