I enabled taint log tracking because I kept getting an interface action error message.

These are the log entries:

12/12 08:01:33.366 An action was blocked in combat because of taint from OmniCC - CompactPartyFrameMember1:Show()
12/12 08:01:33.366 Interface\FrameXML\CompactUnitFrame.lua:290 CompactUnitFrame_UpdateVisible()
12/12 08:01:33.366 Interface\FrameXML\CompactUnitFrame.lua:248 CompactUnitFrame_UpdateAll()
12/12 08:01:33.366 Interface\FrameXML\CompactUnitFrame.lua:100
12/12 08:07:30.929 Interface\FrameXML\UIParent.lua:1627
12/12 08:07:30.929 An action was blocked in combat because of taint from OmniCC - CompactPartyFrameMember1:Show()
12/12 08:07:30.929 Interface\FrameXML\CompactUnitFrame.lua:290 CompactUnitFrame_UpdateVisible()
12/12 08:07:30.929 Interface\FrameXML\CompactUnitFrame.lua:248 CompactUnitFrame_UpdateAll()
12/12 08:07:30.929 Interface\FrameXML\CompactUnitFrame.lua:100

To add to this I got this lua error

Message: [ADDON_ACTION_BLOCKED] AddOn 'OmniCC' tried to call the protected function 'CompactPartyFrameMember1:Show()'.
Time: 12/13/14 08:37:17
Count: 1
Stack: [C]: in function Show' Interface\FrameXML\CompactUnitFrame.lua:290: in functionCompactUnitFrame_UpdateVisible'
Interface\FrameXML\CompactUnitFrame.lua:248: in function `CompactUnitFrame_UpdateAll'
Interface\FrameXML\CompactUnitFrame.lua:100: in function <Interface\FrameXML\CompactUnitFrame.lua:47>

Locals:

I closed this too soon.
This happens every time while riding on one of the mounts you get from your stables. When you do the quest to train them by fighting a mob.

Even with no other addons enabled I get this taint error. I had thought it was tidyplates causing the taint but I no longer use that addon and still get this.