Hi MichaelC,
It is likely you've came across problems which are present in the recent X window system. Could you please try this FAQ article?
http://support.displaylink.com/knowl...ent-x-upgrades
Let me know how it goes. There is a related thread as well:
http://displaylink.org/forum/showthread.php?t=65364
Cheers,
Szymon