I updated TT desktop with the latest 3/1/19 program change and although there were no indications in the update notes that TT fixed anything, I decided to submit my return again and the return was finally accepted. It appears form 2210 looks like before, Part II, A is checked with a notation of 85% Waiver. An Explanation Statement was generated, but I don't believe it was sent to the IRS. So it appears whatever was causing the problem was fixed.
