Not sure if this is a known bug, but when I open threads that I've subbed to, they always open 2+ entries prior to where I finished.
In the past it used to remember exactly the last post I read, and when I opened the thread the next day it would continue from the first new post.
Now I sometimes have to scroll down even a few 'pages' (in height) to get to the latest posts, which is especially noticeable in 'gallery' themed threads with graphically larger entries.
Using latest Google Chrome Version 35.0.1916.153 m
(tested on 3 different PCs)