Have you already tried using the Cmd+Option trick?
If not, follows these steps:
- Open system preferences (quit it if already running)
- While holding Cmd+Option keys click on the Display icon
You should see the rotation option on every screen.
If this trick doesn't work, could you please use the tool here
http://www.displaylink.com/support/ticket.php?id=269, connect both the adapters, gather info and post the output file. Thanks