Blizzard_TalentUI being blocked?, in Other for Undefined.

"Blizzard_Talent_UI has been blocked from an action only available to the Blizzard UI. You can disable this addon and reload the UI."
This error pops up when trying to change talents, with the options being "Disable" or "Ignore". Disabling this addon causes the Talent UI to no longer be able to open at all.

Another one I'm getting upon logging in is "Couldn't load Blizzard_TimeManager: Disabled" with the only option being to click "Okay".