rdesktop Usb device Issue

Hi
I work for a housing association and am currently converting 40 Pc's to thin client machines, as we are a profit free organisation this is an ideal solution for us. They will be connecting to a Server farm that uses Windows Server 2008 R2, I have got around the black cursor issue, but every time that I map usb using* rdesktop -r disk:disk=/media/ it fails to allow the data on mapped drives to be copied beyond the root folder, although the same the line of code works fine using terminal services on Windows 2003. There must be a fixed version somewhere as Wyse and Hp thin clients both use the rdesktop protocol perfectly. Is any one aware of any fixes for this issue. Thank you for any help that you can provide.

Cheers
Martyn