I just recently purchased and received the 4500 to replace my old Linksys WRT54GS. However, I cannot get a wireless signal unless I move my laptop to the dining room, closer to the router. Even worse is that I can't connect to Xbox live, no matter what I do, and yes I did read the Gamefuel sticky, although I did change the 802.11 mode to Mixed, rather than N or G only; which didn't let me connect to XBL anyway. I'm using the wireless N card for my Xbox, not a ethernet cable.
The FW is 1.21NA and the router is located in my roommate's bedroom down the hall. Short of upgrading to 1.22NA, what else can I do? I'm using a macbook if that makes a difference.