D211 seems to have problem with ZyXEL WLAN APs, basicly no matter with which ZyXEL model.
Everything works just fine when SSID is not hidden, D211 can find wireless network and associate with it properly with correct speed.
But when (E)SSID is hidden in AP configuration, D211 can not associate with it anymore. SSID, channel, speed, etc. are all entered properly to D211 configuration, and link is even created but there is no data going though at all.
And when (E)SSID is set not to be hidden in AP, everything works again just great.
ZyXEL uses Intersil chips/pcmcia-cards built-in in current 802.11b APs. D211 driver version is 4.33
I can provide different ZyXEL APs for interop. testing if needed.