Get the
ActionBlocked addon before the whole beta category is deleted.
That might help you get a bit more detailed info about what specific function was called and what called it.
Those messages especially in the case of libraries are very much inaccurate.
They sort of "cascade" through addons and it's very hard to pinpoint the culprit.
Needless to say none of the addons you disabled was to blame.
If ActionBlocked reports that x addon tried to call TargetUnit() or DoTradeSkill() or whatever (just examples)
do a text search in your AddOns folder to see which addons might be calling the blocked function.
Start by disabling _them_ to see if it goes away.
Hope it helps