Cannot get ip on encrypted network

Hi. I have 2 wl500g (one is premium) and the same problem with both.

When i try to set them to encrypt the wifi (WEP or any other method) the clients seem to fail on getting an ip over wifi from the DHCP server (the embed DHCP server or any other). If the signal is clear, no problem, all computers or handheld devices get their ip via wifi.

So what am i doing wrong? I've seached the net and this forum for similar problems with no luck.

Any tips?

PS: both wl500g have the latest Oleg firmware.

Thanks