Haha I was there yesterday and experienced the same thing. I have an iPhone, iPad and MacBook Pro for the record. I used the Boingo app on my iPhone and was connected and browsing instantly. I took out my MBP as a mechanical failure caused a delay, so I thought I would browse in comfort. No luck there, I tried typing in my credentials over and over again but it just would not load. Sometimes it would not even log me in. I used my iPad as a sort of control and it worked perfectly on there. I use Google Chrome normally but neither that nor Safari was of any use. Shame, I've never got it to work on my MBP to be honest