There does seem to be an impossible bug in RabidVWM that will cause it to freeze under certain conditions. I can stop it from freezing, it's actually very simple, but I haven't done it because it would just be hiding the bug instead of fixing it.

It seems that this is more widespread than I realized though, so I'll try to get a build out before long that won't freeze. Hiding the bug will probably render it harmless, as frustrating as it is to not know the real cause.