Problem with thumbnails in Develop mode

Question

Lightroom Classic 11.3.1 Release. If you check out the video you'll see I'm in Develop mode and clicking through the thumbnails results in other thumbnails going blank grey. Not an ideal feature. When I'm in Library mode thumbnails 9, 10, 14 and 15 are greyed out blank.

Things are obviously in a mess now as when I exit (with backup and optimize enabled) because LR won't exit and is stuck with this dialog. It will never finish and I will have to force-quit it.

johnrellis · Accepted Answer

Looks like the preview cache has been corrupted. Try deleting it, as described in this help article:

https://helpx.adobe.com/lightroom-classic/kb/lightroom-gives-error-preview-cache.html

After deleting it, LR will regenerate the previews on demand, which, depending on your photos and the speed of your computer, may cause it to be a little sluggish. You could go to All Photographs, select all photos, and do the menu command Library > Previews > Build Standard-Sized Previews and let it run over night.

andys98318584 · Answer

Update: This continues to happen despite applying the fix below and upgrading when a new version of LR Classic comes out. It seems to be precipitated by one of a couple of things:

Going through a large number of photos in Grid or Survey mode where I'm in a 'filmstrip at bottom, preview in main window' type setup.
Importing a large number of photos.

If I was a betting man I'd think there was some threading / race condition somewhere in the code.

I'm at a bit of a loss of what do to to be honest. I really like the LR Classic features and workflow but I've definitely got buyers regret. The constant stream of updates with known issues compounds this.

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