Server screen freeze when using client desktop.

I reinstalled Multipilicity on my rebuilt system and have run into a new issue...

When I move my focuse from the server machine onto a clients desktop, the server's desktop space freezes.  For example if I'm playing a video of somekind and move off the server desktop onto a client, the video on the server machine continues to play (evidence by audio continuing) but the video is frozen to the moment I moved off the desktop.

This is also evident on things like browsing the web..  If I enter an new URL and move off the server desktop onto a client before the page has loaded, the browser window will not redraw to the new URL.  If I then re-focus the servers desktop, I have to drag the browser window off the edge of my desktop (off the bottom of the screen or whatever) to force the window to redraw.

Note that none of these behaviors occur if Multiplicity is unloaded from memory..

Looking forward to any help!