Print servers and WEP

I have a computer lab of 25 wireless laptops connecting through a Proxim AP-700.  We use a mobile cart and decided to set a printer on it using a DLink DP-311U print server.  Everything works great until I enable WEP.  I cannot seem to get the print server to see the access point.  I called DLink and they told me it was impossible to add a WEP key in the print server.  While this Proxim device is very complex and worth every dollar, their technical support isn't.  Here are the steps I've taken.  I enabled MAC Authentication, I added in the DLink MAC address.  I can see the print server through the AP but it does not have the IP listed.  (static IP)

Any help on print servers and WEP would be much appreciated.

Thank you