Comment 10 for bug 52405

Could anybody having the issue try to "gnome-session-remove gnome-panel; MENU_VERBOSE=1 GNOME_PANEL_DEBUG=1 BONOBO_ACTIVATION_DEBUG_OUTPUT=1 gnome-panel" and try to note what events make it loop? Having a backtrace with gnome-panel-dbg installed could be useful too, you can attach the panel with "gdb -p $(pidof gnome-panel)" then "thread apply all bt" to get the backtrace