That's the popup message I get on various installations. The current instance is 14.0.9 on Buster. It happens when I'm ready to log out. As I've mentioned before and seen nothing to be done about it, right clicking the desktop produces no response. Thus, I must goto the starter in Kicker to click. That produces $SUBJECT on the first click. Once I've disposed of the popup (that makes clicking the starter a no-op), next click of the starter produces expected result.