We "lost" about 20 tax returns this year.  Finished and save a return, then when client sent back 8879, the program was "Unable to read the data"  Had to reenter the entire return from the copy that was saved in Smart Vault.  Now on top of that, ProSeries had a flaw in the software in calculating Recovery Rebate Credit for ineligible dependents.  Just talked to them about it and wasn't corrected until mid to late March.  Worst year ever for ProSeries and I've been using them for over 20 years.