Yes, that's very hard to localize XP-FS2002-Gmax bug. The thing is the bug appears only on SOME combination of software-hardware. And the most strange thing is the better (newer and powerful) the PC system and OS the more chances it has to lock up... MiG21 doesn't cause any problems under Windows 98 at CPU less than 700. But the lock ups possible under XP on the new systems.

That's a PFM and we are working on it.