After updating I now have this odd bar as well.. I had to go into the Unit Frames-->Party section and check the hide frames option for it to disappear. After unchecking hide frames it would stay gone until I logged in another character. Lather rinse repeat.
Hope it's fixed soon.. if not anyone have a location to find the previous version to use?
I'm seeing the raid/party anchors as soon as I log in or reload UI. They appear in semi-random places with no text in them. If I toggle the hide setting on and back off (hidden then unhidden), the anchors disappear as they should.