I think this problem happens when pidgin starts even before unity starts so no window manager is running at the time and pidgin takes the top left corner(I might totally be wrong). What compiz should do in this situation is the question to be answered though. I have seen this sometimes on restarting unity.
I think this problem happens when pidgin starts even before unity starts so no window manager is running at the time and pidgin takes the top left corner(I might totally be wrong). What compiz should do in this situation is the question to be answered though. I have seen this sometimes on restarting unity.