After you file

Here's what happened.  I hope it will help other unfortunates.  I deleted the 1099R and re-entered it.  I went to "file federal".  1 keystroke from conclusion TT said it needed new info.  YES, back to recipient's zip code followed by State, both of which were unacceptable as shown. I changed the zip (in review) to the 9 digit version.  Review then demanded the State entry in accepted format.  On a hunch I entered NV without pressing shift ie lower case.  WHAMBO it entered capitals and TT accepted it.  

This happened minutes ago so I don't know if IRS accepted it but TT confirmed transmission.

Note I did not clear the cache.  Just these 2 entries were demanded, down from TINs and RMDs previously.  I did note that when I entered NV as upper case ie while pressing "shift" it was minutely off center in the tiny box. Without "shift" NV was upper case and central.

Do they teach this in software school?