Comment 6 for bug 154596

I have seen this bug too on a fresh gutsy install. I am using the nvidia-new driver on amd64. I believe what happens is, when a new window is drawn for someone that isn't the active session, it does not get the window decoration. My wife and I share a computer, and use the user switching applet to go back and forth between our sessions. Whenever one of us gets a message in pidgin while the other person is using the computer, when we switch back to our session, that message does not have window decorations.