Same issue. Same lovely gibberish in the explanatory message box.
After looking closely at my Schedule A, I see that TurboTax is under-reporting my mortgage interest by about $5000. No, I haven't hit any limits. The software has a bug and it's not notifying users. . Had I trusted the software and not closely reviewed my Schedule A, I wouldn't have found this error and it would have cost me about $1600.
