Hi,
Please run through this guide:
http://www.displaylink.org/forum/showthread.php?t=896
As soon as the issue is seen please attach the output of this tool:
http://www.displaylink.com/support/ticket.php?id=269
Once downloaded, please run it and select "Gather Support Information"
It's also worth trying the "System Compatibility Check" to see if anything is flagged up.
Thanks,
James