Hi, @SteamTrain:
You are amazing! Yes, that was the exact cause. Box 1 should be entered as $51749.60 instead of $51749.50. I missed that small error. I thought Turbo Tax rounds the numbers, so the cents wouldn't matter esp. if they rounded up to be the same. But as you suspected, the $0.10 difference must have triggered a hidden issue in TurboTax. The issue probably was there last year, but my entries with other correct 1099-R numbers didn't trigger it.
If Turbo Tax could add a change to alert user of such discrepancies for the user to catch and correct the data error, it would be nice. (c.c. @DanaB27 )
Thank you very much for investigating this issue! Although I have already filed my tax by mail as I don't know when this issue would be resolved, I am so glad to know the cause! Next year, I can avoid a similar issue and hopefully be able to eFile again.
JoAnn
