I wasn’t allowed to upload “this file type” so here is a link instead:
user_nxdir.tar.gz
Only time I can point at for your to look at would be when I made the original post. Didn’t take note of any other times.
KolourPaint was the only thing I encountered that didn’t shift the colours when it occured. Opening an image in whatever the default viewer was, VLC, video in Firefox, all had the shifting.
I’ve ditched Fedora for the time being. No similar issues on Linux Mint (same hardware) so far.