Hi all,This has worked for someone who had FS quit - vanish - without a warning after loading the 737 800-900 :Make sure the swap file is *system managed*control panel/performance/system/advanced/performance/advanced/virtual memory/...anthonyAnthony MertonPrecision Manuals Developmenthttp://www.precisionmanuals.com

Helped me when I used load manager to set up the loads for each plane.Before that 800/900 caused spontaneous crashing of FS.

G'day Fella'sAnother possibility is a problem I was having with crashes to desktop, not necessarily releted to the PMDG 737 series but may help.A number of weeks back I was continually stuck with FS crashing to desktop and in worst case scenario would completely re-boot my system without warning, this happened anywhere in a flight and murphy's law had it happen on finals, of course.Now this had me scratching my head for months till one day I remembered I was using that NOCD.exe file, replacing it with the original fs9.exe and hey presto !! stable flight sim.Now wether this may or may not help, it certainly is worth trying out, hope it helps.BLW, I forgot to say that I also played with a number of other system setting as well, but it was the change to the original file that did the trick.