I'm constantly having exactly the same problem. On some other forums I figured out that it depends on your location. To connect etherdelta just turn on VPN or use it from TOR browser (which exactly the same). It might be a bit laggy afterwards and have a delay with showing your account balance but at least you will be able to load the page.
Really? That an interesting suggestion I will have to try. Did you also figure out which locations are worse for accessing Etherdelta?