Hi
Thanks for the logs. Looking the System Details.txt, it shows that a DisplayLink device has never been detected on the USB bus, so there is nothing for our software to talk to. However the USB hubs in the dock are working, which is why your keyboard and mouse are working.
This looks like a hardware problem. We have an article on this here:
http://www.displaylink.com/support/ticket.php?id=323
But I think you have probably tried most of the suggestions in here. I think it would be best to contact Targus for a replacement dock if this continues.
Wim