Do you use the desktop effects? Does it happen without them? The bug tracker is about describing issues so they can be fixed, maybe you can try using the support tracker if you are trying to figure what is wrong and then open a bug when you have details
Do you use the desktop effects? Does it happen without them? The bug tracker is about describing issues so they can be fixed, maybe you can try using the support tracker if you are trying to figure what is wrong and then open a bug when you have details