When I try to do some things with my bags (seems to be a little random but has happened on different characters), it fails the action saying "Bagnon has been blocked from an action only available to the Blizzard UI. You can disable this addon and reload the UI."

This has started happening since the 5.4.8 patch, and may be related to the changes they made to CVars accessibility from addons:

http://us.battle.net/wow/en/forum/topic/12674209697

Sorry I can't be more precise about which actions I was doing when it failed.

I later found the actions that I was doing to trigger it. I was planting seeds on my farm strangely enough.

May have something to do with combat on the farm in Sunsong Ranch.

Feel free to reopen it if you can replicate the issue, otherwise I haven't seen it in the last few days so Blizz may have fixed it.