Wiki conflict with Headway theme

Hello,

Headway is conflicting with the Wiki plugin.

The Discussion tab which should show a comment box, but all there is is a blank page.

I have deactivated all plugin, which did not fix the blank page.

I switched themes to "twenty twelve" theme and the comment form showed up, switched back to Headway and they were gone.

Is there anything I can do about this? is there a no conflict script I can install?

http://mydevelepmentsites.com/sil_wp/wiki/test-wiki/communications/?action=discussion

Thanks