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What has been changed on your system (updates patches) when the error occurs?
You can take a look here:
Do you have installed the latest version of Lightroom 6?
If not try to downlaod and install the actual version here
Thank you very much for your reply. I tried resetting the preferences. I got the preferences box, answered "yes" and then selected the current catalog when offered a choice of catalogs. But, alas, Lightroom is still not opening.
A bit more information. (My bad for not including this at the outset. I am sick at the moment, so brain not running at full throttle.):
- I had had problems with Lightroom stability a few months ago, which were solved by updating the graphics card if I recall correctly.
- There had indeed been a Windows update before the recent round of problems started, so that is a likely source of the issues.
- Hewlett Packard hasn't been able to find a fix so far, and has suggested uninstalling and reinstalling the Lightroom software. I have not tried this yet. Will it affect any of my Lightroom catalogs or data? (I was hesitant to try this without being 200% sure that I'm not going to mess up anything.)