The navigation template was one of those which had to be manually reverted due to a bug.
See this post for a full list: http://xenforo.com/community/threads/xenforo-1-0-0-beta-4-released.8732/#post-120570
If you revert it and then install the add-on again it should work fine.
See this post for a full list: http://xenforo.com/community/threads/xenforo-1-0-0-beta-4-released.8732/#post-120570
If you revert it and then install the add-on again it should work fine.