Hi,
What happens when you try and mirror to the other display?
I'd recommend checking out the user manual here:
http://downloads.displaylink.com/man...rManual7.6.pdf
If you're not having any luck 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"
When you reply please select "Manage Attachments" from the "Additional Options" section below.
From there select Upload and navigate to the output of the tool which will be in a folder called "DisplayLink Support Files" on your desktop.
Thanks,
James