I had this same problem a year ago and don't recall where I found the solution, nor what the actual solution was, just recall that it was something simple. Now having same problem with 2021 TT. Called helpline, which was zero help, zip, nada -- the girl I talked to even said she was asking for help from someone else, then said to expect a call-back in a few minutes, and that was over an hour ago. Since I recall it was a simple solution a year ago, started trying simple things -- first went into computer settings and changed resolution to 600 x 800 or 640 x 840 or something, no luck. From here it's confusing because I tried several things and got activated and running TT. I think what I did finally was right-click on my TT icon for Properties, then went to Compatibility, then clicked boxes to override my computer settings and use the TT application settings, saved, clicked okay, then opened TT. After finally getting into TT, then exited out and re-set back to original settings, and re-opened TT and it works. Still no call-back for TT help folks. Hope this helps someone. To actually list all the details of what I did, I would actually need to do them and right down each step as I went, but it was simple, just aggravating. I'm not very computer savvy.
