I'd check that your PC meets the specs needed for Windows 7 with DisplayLink:
http://www.displaylink.com/support/ticket.php?id=52
Its also worth updating the primary graphics drivers to the latest version as this can improve performance with DisplayLink.
The GUI is a cut down version on Windows 7 with v5.6 DisplayLink software. However a "full" GUI similar to DisplayLink software on XP/Vista will be available in our next release.
Wim