I have permanently resolved this issue (for myself) by creating new replacment panels and dragging all old launchers to the new panels and removing the old (and now empty) panels.
I can now logout and back in and everything works as expected.
I have permanently resolved this issue (for myself) by creating new replacment panels and dragging all old launchers to the new panels and removing the old (and now empty) panels.
I can now logout and back in and everything works as expected.