could be a number of things here... first, it may be the tray icon not updating properly - if you can check the services control manager and see if the AvCsMgr service is "stopping" or, indeed, stopped that would be helpful. If it is stuck in a stopping state for a period of time like that you can force the services down with a "Kill" command.

Kill can be found in the \commserver directory - run "Kill AV*.* -f" (the -f means "force") - this will stop all services that start with "AV" in a jiffy, no questions asked. you can then restart the services again without restarting the entire server. I use this method from time to time on systems where shut down gets stuck, although of late I haven't run into that on any of my systems.