After all the database and version problems I had in December, everything seems to be working fine. However, tonight I scrolled to the end of the QSO list and there are no QSOs shown prior to 2020-12-15. This was alarming!
I made sure there were no filters. I tried re-sorting the list. Same problem.
Then, in desperation I checked my ADIF backup files and all QSOs are there. Whew!
Then, in CQRlog I set up a filter for QSOs from 2016-01-01 to 2019-12-31 and the missing QSOs appeared in the list. I cleared the filter and they disappeared again.
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