It is pretty strange that its doesn’t work for you. What browser do you use to test 2d scroller template ? Firefox Nightly not working for me at all, i have got black screen in my UE4 game too, so my solution is : get some local web server (because Nightly do that for you), winginx for example and host scroller template on it. After that you can use google chrome x32 or anything else.
Hard to say whats wrong with your camera at the moment. Can you share your project ?