As maybe many of you observed as well, the Remote Desktop components shipped with Vista and XP SP3 (especially XP!) are not as stable that the previous versions. My personal experience includes sudden disconnects (when heavy graphics in the remote sessions are involved) as well as "stuck" sessions. These sessions are stuck when you try to gracefully disconnect a remote session. Somehow - and don't ask me why - the remote desktop component thinks it must try to reconnect, which never happens. The nice reconnect screen has a disabled or useless "Cancel" button. So, the session is "stuck".

Only remedy (now): Shutdown Royal TS and restart it.

Royal TS get's a new menu item "Force Disconnect" to destroy the ActiveX control itself by force and should only be used in that rare occasion.