@jpangamarca, The first attempt to get a backtrace did not work well. Gnome-panel has a very long list of dependencies though, and I only installed the debug symbols for gnome-panel itself. The effect that I got was that when the problem occurred the gnome debugger seemed to make the problem worse as none of my previously documented tricks for regaining control of the X session would work. I had to use the run application dialog to run killall gnome-panel. There was nothing in the backtrace after the initial startup messages (one for each dependency!) and it noting when I terminated it. The problem occurred when I was using an xpra session to an instance of thunderbird running under another user account on the same machine. There were some xsession messages, which are attached.
** Attachment added: "xsession-errors-2" http://launchpadlibrarian.net/52636058/xsession-errors-2 -- Gnome Panel hangs and renders touchpad and mouse unusable https://bugs.launchpad.net/bugs/608833 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs