USR WPA-PSK fails to connect with limited XP user

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(I posted this question earlier in the USR Networking Solutions Forum, but received no reactions).

I am using a USR wireless router 805450 and PCI card 805416 with XP SP1.

I recently installed the WPA update for the firmware (v1.41) and driver (v6.0b14). The connection with WPA works fine for users with administrative priviliges, however it fails to connect (authorize) XP users with limited priviliges.
When I go back to WEP, everything works fine.

I tried to give the limited users full access to the USR directory and the USR registry key, but without succes.

Any suggestions what to try next?

Thanks,
Alex