Hi there,
Okay – I’ll have a think about doing that. I have about 20 plugins on the site, so it might take a while!
I have started theming via your guide, but only at the CSS level right now.
I can tell that the comments don’t even render on the page, so I’m thinking it’s a templating issue – so I might try to see if I can get nested comments to appear via that route first. If it doesn’t work, then I’ll disable the plugins on my dev build 🙂