Those taint messages from bugsack are the result of that addon trying to call protected functions on the secure action button frames during combat. They *might* be related to your problem, but likely are not.
Let me know if you can reproduce it.
Also... make sure you didn't end up switching the page of the main action bar... you can press "shift-1" to select the first action page. Sometimes when button mashing folks accidentally change the action bar page and don't realize it, then freak out because the buttons are gone. Shift-1 should always bring you back to the main action bar page if that happens.
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