I received an email stating that the sign-on do-loop issue has been resolved. I've just spent another 3 hours trying to reinstall multiple times, including removing and re-installing TT, making intuit a trusted site, running as administrator, checking Windows Installer, and all the other advice that I have been reading.
It still does not work - I'm getting the exact same loop bringing me back to sign-on. Ready to switch software or do taxes by hand at this point.
