[sphinx1912]

How much and how old is your memory?
Is your system over clocked?

This sounds very much like a problem with ram going bad (age/over clock related).
Since the modded version of Il-2 uses so much more ram for textures, sounds etc. There is a greater chance to find Ram addresses that no longer work correctly.

S!

Sounds like you're onto something. The RAM in my system is not even a year old and I'm running 4 gigs but perhaps I need more as the campaign I am working on is heavy in movement e.g. aircraft and ground units, so that plus the upgrade in textures etc. is the likely culprit. I was just hoping I could get away without having to buy any more/replace what I have. Thanks for the feedback guys!