So I have a Airport Express network set up in my dorm room from an ethernet using my school's internet and often use the the school's real wireless network when I'm other places on campus besides my dorm room. However, I prefer to use my own network in my room for the perks of the Airport Express like Airtunes and wireless printing. Anyhow, I've noticed that whenever I switch networks, that is take my MBP to a different place on campus and use the school's real wireless network, when I come back and connect to my dorm room network Airport connects fine, but shows no sign of being connected to the internet. I can connect fine and even play music through iTunes and remote speakers fine, but no webpage will load and I can't retrieve any email. Not sure what is going on or if it is the Airport problems others have been hinting with in Leopard. I'm running 10.5.1. Any help would be greatly appreciated. The only work-around I've come up with is to restart, turn off airport, and disconnect and reconnect a few times, but that really doesn't work that well.