Is anyone else having trouble adding functions in Graphcool Cloud? When I add a function, the page just hangs and does nothing…

So this might be too late, but... This happens to me if there's a syntax error in my code. Check your syntax with esprima: http://esprima.org/demo/validate.html You can also open the browser console, and you should see an Amazon error HTTP 502, which is not "Bad Gateway" but actually an internal server error.