Any open access point I try to connect to gives me the "internet connection failed. unable to retrieve IP address from server. try again?" message.

It started happening sometime after the first SSU for diablo. I've tried several AP, some of which I've connected to before, and they all give me this message. I can see other people using the same AP on laptops and things.

I have no idea how to trouble shoot this. Is there log file I can look at, a cache to clear, or a config file to reset/tweak?

I can connect to every AP I've tried if it has WEP enabled.

Thanks in advance for any help,
Matt