FWIW I only ever saw it during shutdown or restart (and
only after some changes were made) BUT it was only displayed briefly before being usually hidden behind one of those "ending program" dialogs.
If you cancel that dialog the Rightclick save dialog can be properly clicked.
I also had RC unloaded when I updated and lost all customisations - luckily they weren't extensive and thus easy to re-create. I think a 'save/load theme' option is a good idea.