After entering 1099-misc numbers I can't enter any more data anywhere

(This may be related to the 'stuck in loop' problem)

Previously I had the 'stuck in loop' problem. Today I deleted the 2021 forms I had used and started over. After importing data from last year's  return, I chose to 'work on items I select', and entered my 1099-misc data. Strangely, after I was done with that, TT did not ask any questions. The I went to another area (they all behaved the same, I chose SS data). I couldn't enter any data. I could highlight the $0 value, but couldn't enter a value. Them, upon exiting the program, I got error 70001, 'TT  is already running' - 'switch users and run from the other account'.

I had just turned on this computer and started TT. There are no other accounts on this system. My internet access is fine, and this is not an intermittent issue - it happens every time.