Thanks, Ian. Your comment was by far the most helpful to me so far. I was expecting that LrC 13.2 or LrC 13.3 would have alerted me if my catalog file was corrupted in any way, including its possible unsuitability to be upgraded to LrC 13.3. As you have now suggested, I am testing my older backup catalogs to see if any of them are stable for upgrading to LrC 13.4. So far, this is proving a more subtle problem than I imagined. Thanks again for your most helpful suggestion.
--Pat Cooney
Thanks yet again, Ian. Your suggestion was right on.
Using LrC 13.4, I did a binary search through many of my recent catalog backups, testing each till it crashed (or not). I found that my catalog of 2024-06-07 was the most recent one that did not exhibit this problem. After aditional testing on it, I updated it with all my photos made since then. So far, so good.
--Pat Cooney
--Pat Cooney