Manjaro/Arch … dt 4.7.0
On opening older folders I noticed some RAW images displayed in both the lighttable and in the darkroom simply as black. On investigation I find that these are cases where I have used depreciated modules such as the channel-mixer.
The situation is easily remedied … in fact it gives me an opportunity to rethink and revise my processing in line with more current thinking … and definitely with far better results.