15.5.1 and Tahoe 26.6.2 - issues with previews?

Forum|Forum|7 days ago
August 28, 2026
4 replies
95 views

I’m tearing my hair out - after updating yesterday I can’t seem to generate any previews at all in LRC. When I try to create them it seems to stick on the 5th photo for some weird reason. I’ve tried generating previews for a few different selections and it always sticks on 5.

Troubleshooting already tried:

Purged Camera Raw Cache
Deleted and rebuilt the Previews.lrdata file
Confirmed adequate free disk space
Disabled "Use Graphics Processor"
Ran File > Optimize Catalog
Removed and reimported the photos
Tested in a brand-new, empty catalog — same stall
Fully uninstalled and cleanly reinstalled Lightroom Classic
Confirmed no third-party antivirus interfering
Granted Full Disk Access (fixed it previously, but issue has returned)
Checked Console.app during the stall — no Lightroom-specific fault, only routine macOS system activity

The only thing that seems to work is going back to an older version of LRC (currently using 15.2.1). That seems to work perfectly fine - but my current catalog has been ugraded to work with the newer version so I can’t open it!

Any ideas are appreciated - I’m on about hour 6 of going slowly insane...

B

BSAbbott

Participant

Yes I am on 15.4.1 and the catalog appeared to work. I lost things like export presets, but nothing painful so far. The import process seemed to take longer than previous versions. A little frustrating for professional priced software. Peace

johnrellis

Legend

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@powerful_Everglow2921 The only thing that seems to work is going back to an older version of LRC (currently using 15.2.1). That seems to work perfectly fine - but my current catalog has been ugraded to work with the newer version so I can’t open it!

Did you try rolling back to 15.4.1? It’s catalog format is compatible with 15.5.1

B

BSAbbott

Participant

Me too! I tried a few of your ideas, but went back a version. Still slow to import and build previews, but it seemed to work enough. I’ve noticed a steady decline in performance. Lightroom desktop seemed to work as well as ever. So did DXO Photolab. I like what LRC does, but this implementation is terrible. I’m on a macbook 5 pro, should be fast enough. Peace

P

powerful_Everglow2921Author

Participant

I’ve managed the version back and it’s not even letting me import photos - I selected the photos to import and it imported aboiut 15% of them and told me there were already smart previews when there are clearly no smart previews...ffssssss

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