Hi All,

I got some great advice from Martin on this issue - run darktable-generate-cache it took a couple of hours but when finished I could open a folder without having contaminating thumbnails in my light-table view.

I have been working on a few folders recently and the problem crept in again, so I ran darktable-generate-cache again but this time only half an hour. I have not been so lucky. There are still a few incorrect thumbnails.

Some background on my process may be helpful.
I upload my images from the camera card to a folder in my SSD called "working", this is so that I can work more easily.  A friend of mine who is a Linux sys-admin has set up a series of backup processes which are automated and run in the background. For example he has written a script which creates a hierarchy when a new folder is created in the working directory, I then copy my RAW files into the RAW dir of this hierarchy, and I copy the camera generated jpgs into the JPG dir. An "Exported" folder contains 3 folders Full Size  Proofs and IG. In darktable I load my RAW files and add to library, and things are fine. But if, after processing the files from the session, I return and generate some duplicates even up to five different treatments of an image, then, on the next time I open that set I have thumbnails from other folders occupying my light-table. When I select the intrusive image it reveals the image which should have been there.

When I have done processing I move the Exported files to the Photos folder on my RAID 1 drive, and I also move my RAW files to the RAID 1 drive. Then I delete the remnants from my "Working" folder on the SSD.

Now I have been running this same process for three years without any issues, but when the new import process was put in place I have a lot of trouble. For me the former process was perfect.

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