I have the same problem in Free Edition. 1040 SR, Line 12c appears blank instead of showing the sum of 12a and 12b. However, the real 12c calculation must be buried under the blank space since subsequent calculations using 12c are correct.
With Free Edition, I don't have access to editing specific entries on forms. So if I e-file federal as it appears now, IRS could easily reject the calculations that would ensue from a blank line 12c.
This is clearly a bug. Will a fix be offered?
