I wish I had better news. I just gave up and did what James recommended in this thread, which was to “fake” a small profit on one item and thus pay a few dollars more in taxes than I should have. You’ve got a lot more hoops to jump through doing it this way but it was the only way I could get around it and submit my return without an error. I am STILL SO MAD about this experience. 30 years of smooth sailing with TT, but this stupid error that should have been an easy fix and was completely ignored by TT will have me going elsewhere next year.
