I have almost the exact same problem. One day my comments disappeared on the pages the comments were activated. When I change the theme they came back, – so it’s definitely a theme problem. I’ve also tried replacing my comments.php with one from an older version of evolve. Still no solution.

Comments should be enabled on this page:
Link: http://peopleresource.dk/gratis-feedback-paa-ansoegning/

Please help – thanks! 🙂