I have an issue displaying articles using Helix Ultimate template. I have created a second theme for the template which is only used for the landing page. This theme has no header or footer so the landing page for the site remains plain. The remainder of the site has a theme with a header and footer and all works OK until I want to view an article. When clicking to view an article from within a Blog view or from a component like latest news it seems to default back to using the landing page theme and I can't see where I can override this. The same seems to happen if I only use the default theme and add a Page Class to the default menu item and use CSS to hide the header and footer, the article page seems to inherit the class from the default page and therefore has no header or footer.

Any ideas? Thanks