Running aMule under XGL/Compiz removes all window borders. App cannot be resized, closed, or moved. aMule version 2.1.0 (sorry, picked the wrong one on thread creation).
I too have been experiencing frequent crashes. Searching this forum suggests upgrading wxGTK to 2.6.3. Official version under Ubuntu Dapper 6.06 is 2.6.1.2. Could this be causing both problems?