@tk94110
If there's a bug at all, the bug may be that the description of the checkbox is wrong, or maybe you misread it. In my TurboTax Premier CD/Download software for Windows it does not say "or missing." It just says the cost basis is incorrect.
In any case, when you enter the sale, if there is no cost basis on the 1099-B, enter the correct cost basis in box 1e, even though it's not on the 1099-B. Do not check the box saying that the basis is missing or incorrect on the 1099-B. That checkbox is only for an incorrect cost basis on the 1099-B, not for a missing cost basis.
