Hi Frederick and Andre, congrats for the new forum. Just a couple of things in the visual style, maybe it's a easy fix with CSS.
1) There's a big blank space under the signature which ruins a bit the style of the posts and the readability, it makes the signature to appear as a quoted post.
2) The black horizontal bar which separates the posts has a too strong color and it gives the idea that the posts are separated elements, and the eye, or at least, my eye, doesn't follow the flow of the discussion. More over it has some information redundancy with the lower bar under the signature (number of post, time), maybe it could be removed completely to allow for a cleaner design. In general many layout elements distract the eye and the design trend of our times goes into the direction of simplicity.
3) This was already noted by some other user, but even if I'm a developer, I feel that the ads are a bit too much present. In particular the animated banner at the end of any thread, which is a bit distracting and possibly derailing from the topic thread. Moreover when it rotates to another ad the whole page flips to accomodate the change in height and this is quite irritating if you are writing in the reply box.
4) The big list of developer icons on the bottom is nice, but it should be reserved in few pages, to save resources, and it makes the mobile navigation experience a bit odd.
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If ads are a necessity maybe a right vertical banner as you can see in gearslutz can be helpful.
Just my two cents, anyway I'm going to explore further the functionalities of the new forum!
Thanks for your work