Commentary not a solution to the original question - I have a different problem, but curious did you install the desktop copy of Turbotax or did you amend using the online version? I was told (by TTax help) that I could only use the Desktop version so I paid for that after my original return was accepted online. Anyway, my problem is I cannot get the "Review again" link to work so I can fix my rejected amended return. Good luck on your endless loop issue.
