Retirement tax questions

Perhaps I'm late to the party. I do have an inherited IRA. Two weeks ago,  I entered my 1099-R into Step by Step, the fields for box 1 (Gross distributions) and box 2 (Taxable amount). When I printed out Form 1040, only the box 1 entry flowed into 1040 Line 4a. The Box 2 entry should have been on Line 4b, but was 0.

Two days ago, when I updated the software (for other reasons), the box for 1040, 4b had the correct entry. Seems like there are other problems afoot besides the ones described earlier.