I have the exact same problem. Did you find a solution?
I found out what it was. Actually I think this might be caused by a bug in WordPress (or perhaps one of the add-ons I’m using).
In the content editor I had blocked out some of the code with “<!–” and “–>”. For some reasonthe closing markup “–>” didn’t get registered, so in the code anything after the_content();
got blocked out.