I have a role for that is used for staff to access guests in a resource pool. The user needs to have the ability to plug a USB in and access it via the guest. I have added the USB Controller to the guest and added the the following roles
Virtual machine:Configuration:Host USB Device and Add or remove device privileges.
As a user with admin access I can add a USB to the guest but when a user with the specific role access trys the Connect to USB is selectable but the actual USB drive is greyed out.
I have made the user an admin on the physical PC to elimate the client PC and have also run vcentre as administrator to also elimate this as a cause.
Running vsphere 5.0.0 455964
Is there another role that is needed? Any suggestions?