iPhone 5S, 8.1.3. I'm using Safari directly. Clicking "Try It Now" opens a new window (apparently blank, but maybe a white canvas?) And I can't do anything. just a white screen. Just re tested. This is the same behavior on the iPad Air, 8.1.3.
You immediately lost my interest when it promted me to login via Facebook and provided no alternative. As a remote software developer, this could be interesting but requiring Facebook makes it a non starter. I don't imagine I'm the only professional in the world without a Facebook account either.
We're on it, so you'll have alternatives quite soon. What order would you suggest for login, like: email, twitter, fb, G+ ? What's the most painless login option for you?