TurboTax Form 7203 Error Message says Lines 35-46 must be positive but IRS instructions say negative

IRS Form 7203 Part III. Shareholder Allowable Loss and Deduction Items

The instructions on the form clearly state "Enter only negative values (loss) on lines 35 - 46".  TT correctly allows negative values and appears to calculate updated basis correctly, but when attempting to file TT throws an error message saying these amounts must be positive. If you change the amounts to positive the carryforward basis is reduced by double the loss!  

Is there a way to report a suspected bug to TT?