It seems that there is something wrong with navigating discussions that involve multiple pages worth of replies.
Here is one such discussion
if you scroll all the way to the bottom of the page there is an option "next ->", however it appears that this option is not functioning properly. So far I have gotten two behaviors after clicking on that link 1) the page refreshes and none of the 'next' set of posts is actually displayed and 2) the page updates to the next set of post but then when you click on "<- prev" link, at the bottom, you don't get the first set of posts.
In case my explanation is not clear enough, then please try going back and forth between the two pages worth of posts and see if you can detect a problem. I'm using Firefox (latest version) while logged in to tutmanik and also Safari (with identical results) while both logged in and anonymous.
What is the running rate for debugging tutmanik? :-) (Cause I would rather eat it.)