Discussion section not being displayed

Am trying to get the Wiki plugin to work on the Swedish Greys theme, but there seems to be some issue with the discussion/comments tab. Whenever I click to that tab, it loads nothing. Nothing even shows up in the source code.

Of course its a theme issue, it works fine in twentyeleven, but where do I start looking for the fix? Is there some hook from the Wiki plugin that I need to dig out an ensure the theme is loading?

Any idea why it might not work?