This suggestion may actually be some sort of user error on my part - sorry ahead of time if that is the case.
I am the Provider and am using one of the plug-ins like Google Maps or Desktop Sharing. The problem is that the Viewers see in their session the tab at the top of the plug-in that has the little “X” in the right corner. If a Viewer clicks on this “X” then the plug-in is killed for everyone!? My suggestion is to suppress the tab or dsiable the “X” action for Viewers.