There are a few elements that are very faint, and almost invisible until you hover nearby. Report Post shows up when you move your mouse over any part of a post. Same for the little icon to share a post, or hide a signature. Also, on the Topic List, the page numbers associated with a thread on the Topic List. They don't really show up until you hover over a specific topic. It's a design decision, I think. There are a lot of features and interface elements, and giving them all the same visual weight leads to an overwhelming and cluttered UI. Only showing some elements on hover helps to minimize that.