It has been covered previously, but the text/font/size is hard to read and I can't spend more than 5 minutes on the forum without getting a headache.
Also, at the root page of the forum, there is no identification of which categories have new posts in them since your last visit - that was very helpful on the old design as you could see in an instant where there had been new activity and where nothing new had been added.
I'd also suggest having a poll to see if people prefer this design to the old one, because, as far as I can see, there is no real benefit to the new design and several more significant drawbacks.
Also, at the root page of the forum, there is no identification of which categories have new posts in them since your last visit - that was very helpful on the old design as you could see in an instant where there had been new activity and where nothing new had been added.
I'd also suggest having a poll to see if people prefer this design to the old one, because, as far as I can see, there is no real benefit to the new design and several more significant drawbacks.