Just wanted to point out that some of these problems from 3 years ago still exist. When you click on a thread’s most recent reply (under the freshness column), only the most recent reply (or two) shows up. The rest of the thread along with the YWN header is cut off. This problem also exists when you post a new comment.
A short term solution to this problem is to remove the specific post number (ex-remove #post-156235), which enables the entire thread to load. However, a more permanent fix is needed in order to be able to go directly to a thread’s most recent post while still having the rest of the posts load at the top of the page.