@coop00
Thanks for your reply. I've managed to find what I think is a workaround by following the instructions in the last few posts of this thread: here
To wit, use "Open Forms" to add form 8881 to your return. Put zero in Part I line 7. Check 'Yes' in Part II under "Credit for Auto Enrollment Smart Worksheet". $500 Credit appears in lines 9 & 11 as well as on Form 3800 Pt 3 lines dd, 2 & 6.
The only difference I see from your manual solution is that on Schedule 3, the $500 appears on Part I 6a instead of 6z.
I have no idea if this will work or not. Hopefully someone from TurboTax will eventually understand what the problem is and offer a real solution but I will probably call support before that happens.
