I just got this rectangular message on my TV screen. Funny thing is that the program guide DOES work. I just can't get rid of the message on my screen that blocks a lot of the picture. Comcast basic support couldn't fix it. Tried turning off cable box, rebooting, etc. No luck.
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We had the same rectangle box "Program Guide not responding. Do you want to wait?" Our program guide DID work. Just couldn't get rid of box. Did a system refresh, unplugged box etc. Had to call Comcast. They were frustrated too! Ended up scheduling a tech to come out. I switched inputs to Apple TV then back to cable. Lo & behold rectangle box was gone! Yay! Cancelled appointment. Try switching inputs. Good luck