Thanks for your quick reply. Vegas had been working fine for several days until yesterday; yes, it could be the last MPEG 2 clip I added that is causing my project to crash; but every time I try to re-open the project file (or even the .bak file, for that matter), I immediately get the exception error once it fully loads, with no option to remove that last clip, render video or edit further. I suspect that the entire project file is damaged/corrupted/non-repairable. Luckily, I outputted my project to AVI 2 days ago and can edit from that, but that means I lost the last 6 hours of work.
Do I need to change any settings under “preferences”, by the way, to decrease chances of crashing?
Lastly, I do remember seeing a separate Windows error message after rebooting 2 days ago (before the Vegas crashing problem started) indicating some kind of fault/exception with MS .NET Framework (I think it was 3.5). I’ve since upgraded to .NET 4.0.