Consumed potion, did not receive buff. W7-64bit; can't think of anything else that would be relevant. Don't have any more of the potion to re-attempt with. Will report back if I can duplicate the event. Edit: Found another one, failed again. Had a god buff active both times, and maybe a brittle buff active both times. Which actually reminds me of another bug: Some brittle buffs don't get refreshed hits when recast.