Possibly you will need to clear your browser cache (see the following link):
https://ttlc.intuit.com/replies/3302272
After clearing cache, you can close and re-open your browser window and log back into TurboTax Online.
You may also try using a different web browser to login to TurboTax Online (ie: Internet Explorer, Firefox, Chrome, Edge, etc.)
You can also attempt to log in with a different device (ie: tablet or phone, or different computer) to see if you still have the same issue.
