Centrino and Belkin 802.11b and encryption

I have a small wlan setup with a Belkin WAP, a laptop with a Belkin PC
card and a new laptop with a Centrino in it.

When I set WEP encryption to 64 bits all works well. When I set WEP
to 128 bits and type the key into the Centrino it fails to connect.
The PC card works seamlessly. Machines are within 5 feet of the WAP
so I am confident the range isn't an issue

Is there a known incompatibility between Belkin and Centrino
encryption? Anything else I should be trying?

jay