As an FYI, I had a similar problem and downgraded to M3 that solved the problem. Steps taken:
- Disconnect USB
- Uninstall software and graphics entry in Control Panel
- Reboot
- Carry out Clean Uninstall (
http://www.displaylink.com/downloads/file?d=64)
- Install M3 version
- Connect USB when asked
- Reboot.
Hope this helps.