I had the same issue, and called an agent at TurboTax to help fix it. It turns out, my form had around 33 different instances of "zeroes." I had to enter them one at a time and kept hitting enter, until at last, I reached the end and was able to move forward with my application. The problem is, you have no idea where you are in the process, because it doesn't show which particular box you are on as you go...but I kept at it and it worked for me.
