This is a current, 2021 TT Home & Business issue since January. TT is "investigating" (the investigation number INV-19570 will likely not show on this forum but be hidden by the system).
I had to reenter my entire return in Form view, avoiding step-by-step for the software to work. It works just fine in the online or cheaper "Premium" desktop version. Only the more complex Home&Business desktop seems to be affected.
