While Form 4797 is reflecting a loss for the property in question, are the other entries on Form 4797 for this property correct? For example, is the description of the property, date acquired, date sold, gross sales price, depreciation allowed/allowable, cost, correct? Given that the Form 4797 reflects a loss, if you provide some additional information about which entries are correct and not correct (other than the Gain/Loss column) on Form 4797, that would be helpful.
Lastly, another useful remedy to many application issues is to clear your browser's cache and delete cookies. A full or corrupted cache can keep TurboTax from functioning properly. If that doesn't work, try a different browser such as Safari or Firefox if you're currently using Chrome and vice versa.
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