In response to new kernel testing - i will install that one later in the week. This is the first time that this happened - didn't happen in 11.10. I have switched to gnome classic and the problem occurs less often. Don't know whether it is the fglrx driver or problems with unity... Will try 3.4 kernel later on today and will see what happens On May 21, 2012 11:45 AM, "Ron S"