Comment 3 for bug 36882

If this is related to bug 32873, can you try to get a backtrace of gnome-panel? Follow these steps during the hang:
 * ctrl-alt-f1
 * login
 * gdb -p $(pidof gnome-panel)
 * (gdb) set logging on
 * (gdb) set logging file output
 * (gdb) thread all apply bt
 * Ctrl-C
and attach the output file here.