I am convinced this is a bug in TurboTax, but so far I have been unable to get them to correct. I have the same situation, this positive number from Line 24 of 8959 should carry to Line 18f of the Tax Payments Worksheet, which then feeds in to Line 16 of Form 1040. Interestingly when I put cursor on my (blank) Line 18f and click the little spyglass to Go To Supporting Form, it goes correctly to my Form 8959 and shows the positive number. But that number won't transfer and TT will not let me include Form 8959. (Corrected typo, 18f is the correct line number)
