I cannot edit my Upfront themes: clicking the button does nothing.

I have been trying end several Upfront themes, and have not been able to do so. I click the upfront button, it turns blue for 30-60 seconds, and then reverts to gray. However, I do not see any tool popups and I cannot edit any material. (This was working before; it is not working now.) I've granted support access so that you can take a look. Any suggestions are appreciated.
Best,
jason