Could be related to #711231 - not even the crash / apport dialogs get shown so while compiz has crashed, you won't be told until the next session, when the possibly relevant gdm log has already been replaced.
Could be related to #711231 - not even the crash / apport dialogs get shown so while compiz has crashed, you won't be told until the next session, when the possibly relevant gdm log has already been replaced.