Weird crash

One of my beta-testers is experiencing a weird crash (the app immediately crashes) in Windows 7.
On his XP machine, it works though. All other users, wether XP or Win 7/Vista, didn’t experience that crash.
I’ve added the call stack, which I think is kinda weird. It seems like an OwnedArray gets created (which is the case), but then gets called “atexit()”, which is some function I can’t find being used in JUCE.

Any ideas?