[SAS~CirX]

Hang ten, I think I've got this.

In your Main IL2 directory, check among the SFS files for the following 3 files:

fb_3do19.SFS
fb_3do20.SFS
fb_maps15.SFS

They came with the 4.09 update. If any or all of them are missing = 5% crash.

Let us know if this works.