i got the same error on 21 feb. i had a lot of forms / pages open for manually entering data. i closed all forms. i saved to a new location successfully. then i did a save as back to the prior location, and that worked too. i closed ttax. later i will reopen and check for errors.
related is a lot of crashing / freezing. this made me alter my habits and do manual saves after every 3 or 4 entries of data. ttax really needs to upgrade it's platform to do auto saving after every entry. maybe that's why they want users to move to the online platform vs people like myself who prefer to have the CD for longterm storage / reuse.
