I simply don't have a clue as to why it would be incompatible with the Windows screensaver routines on that machine. In order to diagnose it, the problem would have to occur on my machine while I'm using the debugger. The two problems with that are the fact that my machine doesn't crash, and his machine only experiences the problem when Windows attempts to use the screensaver system to launch it (so I assume it wouldn't happen if launched by a debugger).
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