Along the same lines of the dark fonts / dark BG, the "forum with unread posts" checkmark is sort of hard to distinguish (for me, at least). The blue of the check blends pretty well with the surrounding button, so it makes it difficult to tell if there are new posts or not. Of course, I might be the only one that noticed this. Gods know my eyes are in terrible shape
Still, not a 'problem' by far, just...a suggestion, I suppose.