Hi Jan Jonas,
When logged in everything is fine, but now, when logged out, comment-page-2 doesn't finish loading - the wheel keeps spinning, occasionally it finishes and loads to WPAC Fallback url. I had this working correctly before, so probably something I did has caused the error, I just can't find the culprit.
Here is a paged comments post. If you need login, there is a link on top of page (fb or twitter login). The comment form and reply links are only displayed when logged in.