Now I don't have specifics here.. so please no bashing for that, but i'll try to be as specific as possible.
UMDGen crashes for me: UMD Image Generator has encountered a problem and needs to close. We are sorry for the inconvenience. (Debug or Close)
This happens when one of two things happens.
1) I load an ISO that has too many files in it.
2) I am creating an ISO, and I go over this 'file limit'
I'll get to work on getting a concrete # on the file limit, but it seems that games that have a large number of files, simply crash umdgen.
I believe this is due to a buffer issue somewhere, that the list boxes aren't prepared for that much data?.
I've seen numerous people complain on this site of crashing problems, (alot with Talkman, that game has tons of files), and I believe alot of them can be attributed to this bug.
Oh, and ISOs that crash umdgen on load, if I open them in MagicIso, extract out half the files, then delete that half from the iso, and open the iso in umdgen, it works fine. but as I try to drag/drop the other files back into the iso, it eventually crashes when it hits the 'file limit'
Please investigate, and I'm sure you can find more people to solidify this problem.