[ubuntu] cannot connect to Thomson modem

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http://ubuntuforums.org – I am using wicd network manager to connect to my wireless network, it was working fine until I got a new modem/router from my isp, the original one was a livebox but this is a Thomson tg172 modem. I can see my wireless connection in network manager and I can connect to it if I turn encryption off but when its turned on it cannot get an ip address, I set both the modem and the settings on the laptop to wpa-psk. according to package manager I have the latest version of wicd network manager installed. any advice appreciated Spikey (HowTos)