Comment 4 for bug 363032

ok, a little more searching, and I found this:

https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/284211

which has some instructions on editing the connection profiles that network-manager (-gnome?) creates. I removed a wep40, wep104, and ccmp from the group field, and a ccmp from the pairwise field, and now it connects fine.