If it freezes when switching from one window to another that's a known bug in compiz that will be fixed in hardy-updates. Otherwise I can't think of any change between 0.6 and 0.7.4 that would make it freeze on start.
If it freezes when switching from one window to another that's a known bug in compiz that will be fixed in hardy-updates. Otherwise I can't think of any change between 0.6 and 0.7.4 that would make it freeze on start.