I am using TT on-line. I corrected F2210, so box C is now checked and all of 2210 filled in. Can not uncheck box A, so return being rejected. How can I un-check box A?

TurboTax fixed this bug on 15FEB.  Download the latest update.

How do I download an update for TT Online? Do not see anything/anyway
 

Per email from TurboTax: If you are using TurboTax Online, updates are applied automatically.  

Thanks. Box A still checked. Guess I'll wait a few days.