Told you I'd give it a workout :) On first entering combat after a talent change. Frost mage lvl 37 BAEAHVkVsxxZrVqBmAzlSR2f7LAAASRgDQiIiIBAAAAAkASKJJJCAAAAAAAAAgA

1x [ADDON_ACTION_BLOCKED] AddOn 'ConRO' tried to call the protected function 'ActionButton2:SetAttribute()'. [string "@!BugGrabber/BugGrabber.lua"]:480: in function <!BugGrabber/BugGrabber.lua:480> [string "=[C]"]: in function SetAttribute'
[string "@FrameXML/ActionButton.lua"]:330: in function UpdatePressAndHoldAction' [string "@FrameXML/ActionButton.lua"]:392: in function Update'
[string "@FrameXML/ActionButton.lua"]:342: in function UpdateAction' [string "@FrameXML/ActionButton.lua"]:801: in function OnEvent'
[string "@FrameXML/ActionButton.lua"]:196: in function <FrameXML/ActionButton.lua:193>`

Ya, this protected function is one of blizzard taints.