Release 3.3.0.11 fixed it! Now QuickHide remembers and is consistent about what mod to hide on every scene.
Wow, I'm very impressed. Looking at a very old mod, releasing a patch one hour later? You're the man! Anyway, thank you very much!
I am also encountering this problem, why have the "Can be hidden" buttons if they don't do anything at all?
EDIT: Where is the "Player.log" needed to investigate?