AirPort card won't recognize network printer on WEP network with Zyxel router
I have a new Zyxel router that I'm networking to a G4 Mirror Doors with an AirPort card. After much trial and tribulation, the Zyxel support guy and I figured out that in order to connect to the network, we had to lower the security to WEP because there is a conflict between AirPort and AES encryption, and under WPA-PSK, my only choices were AES or TKIP + AES. So now I'm connected to the network just fine using WEP, but my downstairs G4 still won't recognize the upstairs G4 (connected to the router by ethernet) nor the hp printer connected to it. I'm running 10.4.11 on both G4s. I have tried everything I can think of, lowering firewalls, changing settings hither and yon, and nothing seems to work even after restarting. Any ideas?
PowerMac, Mac OS X (10.4.11)