On one of my systems I am running R&D (3.9.0+1643~g60bbf83ac), Manjaro/Arch.
I am trying to compare processing done some years ago with the current R&D version.
I find that I am unable to delete or remove the history from older edits and need to go into the file-manager where I can trash the .xmp file.
Anybody else seeing such a thing.