Screen shows "Invalid" at the top, but does not show any errors.
For the last two days we noticed that our documents are now showing a red "X" with the work Invalid at the top of the screen, but there is no error displayed in the "UI" side of the screen. Some of the documents have been published for a while and never showed such an error before. We can't seem to find anything that might cause this. Not sure if this is the result of a bug or something else is wrong.