Happened twice last night...once when I looted: immediately when I shift clicked on the dead mob's loot. This happened outside an instance. Also happened a few minutes afterwards but when I finished combat.
Interestingly I had bartender set to not lock buttons, so I dragged my spells down from my spell book and where my first action bar would be I was able to add actions. This bar did not have the usual 1 to =/0 on the button faces though. I then logged out to the character screen, logged back in and my default bar 1 was back again!
Is there anything which I can do to help determine where/why this is happening?
Happened three times within 5 minutes tonight. Driving me nutz.