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@PatriciaV - 

Thanks for your idea.  I'd already tried that (didn't include it in my descriptions above) and it didn't help on its own.  When I checked line F ("Change in fiduciary's address") in the Forms view, then exited TT and reentered TT, it again sent me back through the same circus.  The only remaining hope I have is to make that correction as the very final step before submitting the return, and not let TT recheck my return for errors.  Otherwise, I expect TT will cause the same loop again.  And I expect that if I ever enter the return again in the future, it will put me into the same mess.