This did not work for me but just found it somewhere else
Unplug the adapter from the USB port.
Disconnect the DVI cable from the DisplayLink adapter.
Power off the display you normally use with the adapter.
Connect the USB cable between your computer and the DisplayLink adapter.
Wait for your displays to flash (as if a new display was connected).
The light on your DisplayLink adapter should be on now.
Connect the DVI cable to the DisplayLink adapter.
Wait a few seconds and then power on the display connected to the adapter.
If this process doesn't work, try a reboot and repeat the process once Finder finishes starting up.
http://rackerhacker.com/2011/11/17/d...-in-os-x-lion/