I can confirm this bug for Fedora 12 with the following wifi card : Zyxel G-302 v3.
For some other reason I cannot achieve a proper install right now so I can confirm only with the live CD, but symptoms are exactly the same as above : boot ok, user session ok, if I click on the NetworkManager icon I can select the network, then connect to it, enter my WEP key, and then the system will freeze (while asking for the keyring password, secondarily). If I don't try to connect, everything works fine but the system won't shutdown (didn't try to logout).
I can confirm this bug for Fedora 12 with the following wifi card : Zyxel G-302 v3.
For some other reason I cannot achieve a proper install right now so I can confirm only with the live CD, but symptoms are exactly the same as above : boot ok, user session ok, if I click on the NetworkManager icon I can select the network, then connect to it, enter my WEP key, and then the system will freeze (while asking for the keyring password, secondarily). If I don't try to connect, everything works fine but the system won't shutdown (didn't try to logout).
Similar issues happen with Ubuntu, cf https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/368679