Hi,
Can you start by following these steps:
1. Disconnect any DisplayLink devices
2. Uninstall DisplayLink software
3. Download and run the Cleaner tool from here:
http://www.displaylink.com/downloads/sla.php?fileid=121
4. Install latest DisplayLink software v7.9 from here:
http://www.displaylink.com/downloads/downloads.php
5. Connect your DisplayLink devices
Thanks,
James