First, I'd suggest you try to do a manual scan to make sure the card is working. I haven't done this with an Atheros chipset but I'm sure it's the same. Do this:
sudo iwlist <name-of-wifi-interface> scan | less
That should bring up some wifi access points... if it doesn't you may not have your card configured properly or it's not functioning (unlikely, IMHO).
With wicd, I've had problems before because I wasn't in the "netdev" group. Make sure you are a part of this group, it could potentially solve your problem:
sudo gpasswd -a <username> netdev
If none of this works, we'll need to see your wifi card's information. Post the output of: