@maglib I tried filing fed only with no success. Glad it worked for you, but it's not a general solution, apparently.
@CarissaM I tried installing TurboTax on a different Windows computer, downloaded the free state, and tried to eFile the same amended return, with the same error, so I don't think it's something wrong with my installation. Note that I saw advice on another thread to uninstall and reinstall, but when I did that TurboTax refused to re-download the free state (wanted me to pay for it again) so I was stuck before I could even try to eFile. [Update: I was able to restore the Program Files directory from a backup to unstick my original computer back to the original state, but that had no effect on the error we're discussing here.]
Now that I've already filed my state amendment, when I re-run review, it prompts me to print to file, then jumps straight to the end without even prompting to eFile, unless I manually jump to that step. That suggests to me maybe the program thinks I'm required to file on paper for some reason, but it never says that, or says why. Is the combination of amendment plus eFile unsupported?
