I have tried my tests with Gemalto IDBridge CT30 and some Transcend USB Flash drive. Can you give us some info, what is wrong in log files? Or can you give any info about successfully tested USB device?
I tried another USB device (the Flash Drive as you recommend and USB bluetooth dongle), but the result was the same.
I’ve noticed, that after the device is selected for forwarding (in USB forwarding option), the tcp port 5040 is opened on local system. So I tried to telnet this port from remote system and the connection was successful.