Created attachment 105129 [details] timeline header menu screenshot - this disappears The timeline header menu (see attached) disappears after adding a custom shortcut under Settings > Configure Shortcuts
Deleting ~/.local/share/kxmlgui5/kdenlive/kdenlive.rc will bring the menu back.
Deleting /usr/share/kxmlgui5/kdenlive/kdenlive.rc seems to have permanently resolved this.