If you have VODs being saved automatically can you see if there is something there when you stop streaming in OBS. If a VOD shows up then there is nothing really wrong, and its Twitch being Twitch. If nothing shows up please post a log of a stream session -> https://obsproject.com/forum/threads/problem-make-sure-to-post-a-log-and-or-crash-dump-howto.97/
is this one ok?
http://pastebin.com/pJLqs0qB