I just signed up for the A-Team program and created my developer account. I’m doing this from my enterprise desktop. After successful login, I see an empty page.
The behaviour ist the same for IE and Firefox so it appears to be nothing browser-specific. A brief look at the HTML source code showed that you try to open a HTTP(S) connection using port 8080. It looks to me like this port is blocked.
Retrying this again from my private mobile phone at least showed me the first-visit step-1 page, so it looks to be the reason above.