SOFTWARE/OS VERSIONS
Windows: 10 latest update
 
Qt Version: Qt6 Win 64

About a month ago I decided to archive the 2024 photos that I had on a Kingston USB 3.2 External SSD onto a Sata internal HDD. I used Windows cut and paste to transfer the files.
I then, a few days later, used digikam to remove the original album and add the album in a new the new location i.e. as part of the PC rather than on a removable drive.
When I came to open DigiKam the photos I'd moved there were numerous problems with the album I'd moved.
1. Some photos would not open either in digiKam or any other app that I tried. I use DNG format files from Pentax cameras.
2. some photos had the thumbnails greyed out or partially greyed out but could be opened in the editor or other software. IF I use the Bulk Editor to convert these greyed out files to Tiff files then the thumbnails are Ok
3. some photos had the tags were missing or partially missing.

I tried to recover some of the lost photos from the backup but they appear to be in the same condition.  At first I thought this was due to the automatic back-up I have set up, but now I'm not so sure.
Next I was able to recover quite a number of the more  recent photos by using data recovery software on the SD cards I use in the camera.

After doing all this and upgrading from 8.4 to 8.5 I still had problems, namely that when I opened digikam often the thumbnails did not show and as soon as I refresh digikam seems to take over the whole computer and I can use it for nothing until digikam has finished. 
I then assumed there were problems with the digiKam and/or Maria dB installation so I decided to clean out completely both digikam and Maria and start again.
I was unable to get the system working using Maria internal sever so I used the the Internal option when setting up digiKam. 
Everything appeared to be OK when I set up all Albums but now when I open Digikam the thumbnails do not appear and when I try to refresh digikam just takes over the computer and takes forever. I can't use my PC while I wait.
I originally thought that the files that wouldn't open were a result of disc errors but now I'm not so sure as the disc checker doesn't show any errors.

Regards,

Alan