@coldrick: Developer is our experimental stream and as such it breaks now and then and contains bugs (it's the price you pay for living on the edge!). The release notes for that particular snapshot (http://www.opera.com/blogs/desktop/2016/07/opera-developer-40-0-2288-0-update/) mention that Netflix is broken in that build. Just wait for the next build (which will probably be out today or tomorrow), or if you're really impatient, use Beta or Stable for now.