I am having the same issue with my brand new MacBook Pro with BigSur. Had filed all federal returns filed with no issue and just had 2 state to file. Went on today and after a state e-file succeeded, couldn't reopen TT. Tried to delete the file in Preferences and redo. It seemed to work for a second..got the picture of TT people as box said it was checking for updates but then it disappeared. Also tried to create new user with admin privileges and loaded TT and shared TT filed as some other reader suggested. That didn't work either.
Called support 2times. First time person was reading directions to me about e-filing. Second person offered refund..asked, but they would not transfer me to support, given I bought from Amazon. ugh!
