I've had the same problem since upgrading to Edgy: The list of available wireless networks (ESSID) is always empty, or only contains the network you are connected to. No relevant messages appear to show up in /var/log/syslog. Running network-admin from the shell doesn't produce any mesages either.
Hardware: IBM/Lenovo ThinkPad Z60m, ipw2200 wireless -- Can't see available networks https://launchpad.net/bugs/73049 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs