I finally called support. First level phone support was great, but she couldn't get second level support to understand the problem. I sent her the list of TurboTax pages I was going through, she sent that to them, and they still didn't get it. Here's what I sent her for how the pages in TT are looping. Each line below starts with the name of a page in TurboTax Business 2021, followed by my actions on the page.
Here’s your summary (with “this info is different” checked), Continue
Change of address, location or Responsible Party, Continue
Change of Address, Continue
Old Mailing Address, No
New Mailing Address, yes
New Business Address, yes
Old Mailing Address, Continue
Signature Information, Continue
Where to File, Continue
Here’s your summary (and the checkboxes are correctly filled at the bottom of the page).
Pressing Continue starts the whole process again, as above.
The only way out of this is to uncheck that there was a change since last year's return. Even then I had to go through a follow up sequence of pages, which I describe on my second bug report, at https://ttlc.intuit.com/community/taxes/discussion/fiduciary-last-name-is-lost-by-tt-business-2021/0...
Only after that (and saying there's "no change" on both pages (on "Here’s your summary" and, as in my other bug report, "Let’s Verify Name and Address")), can I finally get beyond the bugs and get on with my return. It would great if someone could report these bugs directly to Intuit developers, rather than to the contract customer support company.
The real problem is that if I "lie to TurboTax" (that is, say there's been no change) then I can use TT to prepare my return, but the 1041 form that TT generates to send to the IRS will be wrong (will not show a checkmark on line F for "change in fiduciary's address"). That means I will have to file on paper, so that I can check that box. It's a work around for this bug but it's a real pain.
