It could be that the other user somehow saved his session with his panels disappeared but didn't save it every time he restored the panels. Unfortunately the bug is from 2006 so I don't think asking is going to provide the answer, so I'm still not sure what to do here.
It could be that the other user somehow saved his session with his panels disappeared but didn't save it every time he restored the panels. Unfortunately the bug is from 2006 so I don't think asking is going to provide the answer, so I'm still not sure what to do here.