By the way, if and when you give up hope that TT will ever fix this, there is a work-around that you might consider. Before explaining that, I want to emphasize that you should never change any 1099-R form itself, especially the IRA/SEP/SIMPLE checkbox. Doing so may cause a mismatch if and when the IRS computers cross-check your 1099-R's against your return, may change TT's tax calculation, and will definitely interfere with some TT error checking.
If you have entered all your 1099-R's completely and correctly, and 4b is correct, and 4a is not blank but is also less than 4b (this will happen only if you have more than one IRA and/or pension distribution, and partially taxable one(s) are being included on 4a, but fully taxable one(s) are not):
1. Switch to the forms view, and find and open the "1099-R Summary" form in the list. This is a TT worksheet. not an IRS form, and is not sent with your return.
2. If one or more of your fully taxable IRA distributions are not being included on 4a, got to Line 1 of the 1099-R Summary form labelled "Total gross distributions from box 1 of from 1099-R". Verify that the number there is correct, as the total of all the gross amounts of your IRA distributions. Now right-click that number and override it with an amount exactly one dollar more. You may have to also override Line 8 and/or Line 10 back to their original amount, if either changes to equal the new amount on Line 1. Now look at your 1040 Line 4a. It should now include the correct total of all your gross IRA distributions, plus one dollar.
3. If one or more of your fully taxable pension distributions are not being included on 4a, got to Line 22 of the 1099-R Summary form labelled "Total gross distributions from box 1 of from 1099-R"). Verify that the number there is correct, as the total of all the gross amounts of your pension distributions. Now right-click that number and override it with an amount exactly one dollar more. Now look at your 1040 Line 4a. It should now include the correct total of all your gross pension distributions, plus one dollar.
So now Form 1040 Line 4a is correct, except for being either one dollar high if you overrode only the IRA or only the pension totals, or two dollars high if you had to override both (which I hope is a really rare case).
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