CHG_CANON wrote:
One possible quick fix is to see if there's a "lock" file left-over from your last session. You need to find / know your LRCAT file location. Typically, under your "pictures\lightroom" folder. See if there's a file with extension "lock" in that folder. It will be named the same as your LRCAT file, but with a final ending of ".lock". It's only a 1KB file. See if you delete the lock and can then successfully start LR Classic, if the file is found.
I find a number of catalogs in that folder. The only one that opens is the :V12.lrcat-data and I can find no lock in that folder. I have never attempted a chat with Adobe and in their help sites can find no way to do that among a large number of options that appear to be general question and answer sites. Can you advise how to initiate a chat?