Says I hit a snag. wont let me go any further

Don't panic.  There's always a good reason somewhere on the screen, or a box popped up with more details as to why.  It's not always obvious or where you would expect.  Turbotax is really good that way.

Please try clearing your cookies and cache. For instructions, please click the following links: Clear Cookies - Clear Cache. If you have access to another browser, you may also try to use a different browser or incognito to log into your return. If the error persists, please contact customer care by following the steps here.

Still didn't work after clearing cache and cookies. Also tried on other devices, wired, cellular, and Wi-Fi networks, with no success. The mobile app is giving the same "hit a snag" error, as well. Customer service wants an extra $65 before they help.