WPA PASS PHRASE COMPATIBILTY

I ahve a wifi G Network comprised of a DLink DI-525 Router, A DLink DL-122 USB adapter and a recently added Netgear WGPS Wirelss Print server with 4 port switch, All works sell with WEP Encryption using the same HEX key. When trying to migrate to WAP the two DLINK devices communicate well but at a much lower speed than under WEP but the Netgear is unable to join the network. The passphrase was alpha-numeric and withing the min-max pass phrase limit, Ay assistance would be greatly appreciated, Mark