I have been re-organizing my photo collection. This involves renaming folders and also renaming
the photos in each folder.
I had earlier problems with previews, so I had deleted the previews.lrcat file and restarted LR.
This *should* cause LR to re-generate previews as I visit each folder.
But I discovered that if I rename all photos in a folder (using a present) while LR is in the
process of generating new previews for that folder, then LR "gets stuck" with many previews
not generated. That is, all LR will show for those photos now in Library mode is a gray
preview. It doesn't help to "wait longer"; they stay gray. The only "fix" I know of is to again
re-delete previews.lrcat, and to try to remember to wait until all previews are generated
in a folder before renaming the photos in that folder.
This appears to be a bug. Renaming photos should not cause LR to get confused about the
status of whether previews are generated or not.
Any suggestions for a better workaround?
Thanks. But is there a better follow-up when this happens,
other than just deleting the previews.lrcat file???
Try selecting the grey thumbnails and doing Library > Build Standard-Sized Previews.