Strange. I think many of us are having the same problem: I was easily able to create a new, first-time account. I immediately tried to sign in using the username and PW that I just created and wrote down on this paper in front of me. I verified crosswalks and motorcycles, received a 6-digit code, typed it in accurately and clicked (I think) Verify to continue. My display blinked and re-drew the original sign on screen again, this time with my username filled in, waiting for the password. Fill in password, *blink*, fill in password, *blink*... infinite loop.
I downloaded a fresh new version of Firefox -- same result. HOWEVER, just now I tried to respond to this thread and was presented with the same sign in screen, and it worked, at least to allow me to comment in this forum. I don't yet know if I can now start doing my taxes or not. This may be just a forum sign in, but it does prove that I know my sign in credentials. If I can, I will return with the results. Maybe the forum is the "back door". Ha!
