I've looked at other posts with similar keywords, but none of them seemed to apply quite right.
(I have a Macbook purchased in June 2008)
I am able to use my home wifi, the wifi at my mom's house, and even my neighbor's unsecured connection.
However, every public wifi spot I've tried to work at fails. I AM ABLE TO "connect" to the network (Airport shows I am connected), but when I open a web browser I get a "Not connected to the internet" message. This has now occurred at four different locations. (Also, at one of them, I tried to connect with my iPod touch, and i was able to get online without issue.)
Also, when I first bought this macbook, I did not have this issue.
Any helpful suggestions? Thanks!