I’m using 5.8 release (Arch package).
Ingo,
I’m trying to find more about this issue, and your question reminded me that I tried using 5.8-dev a couple months ago (I wanted to try Capture Sharpening 
). (I’ve been so busy these past few months that I’ve done very little photo processing).
Anyway: it seems like the problem only happens when I use 5.8-release to open raw files with a PP3 generated by 5.8-dev.
I just tried using 5.8-release with some older files, which I’m 99% certain I never opened with 5.8-dev, and I don’t see this problem.
Good to know 
. I won’t try to reproduce then
Sorry… 
I installed RawTherapee_dev_5.8-300-gf4da00158_20200302.exe
and I now have correct thumbnails and editor images! 
(I had to delete all of the old pp3 files)
Thanks again Ingo.
Thank you for this thread! I have been playing around with this for hours, thinking it was all part of ramping-up with a new tool. Just FYI, the 5.8 release for 64-bit Windows (using Canon 5D Mark II) still has the same problem and it is now June 18th.
Just FYI, the 5.8 release build will have this problem forever, as we do not make new 5.8 release builds…
1 Like