Ribbon Workbench does not unhide buttons

Hi,

did anyone else ever experience that buttons you have been hiding with Ribbon workbench did not come back when you tried to "unhide" them? 

Since the newest update it does not seem to work anymore (just updated today).

Ribbon Workbench seems to have a bug here at the moment, because there is not even an "Error Message" but it says "Publish Successful"

Any ideas?

Thank you in advance.

Isabel