Can I suggest one formatting change? The current format appears to be set so that the web page width does not adjust to the browser window, which means that horizontal scroll is necessary... which is very annoying. You might do this on pages where graphic layout is important, but on a forum it doesn't make sense. (It could be the bar across the top that is doing this). I think it ought not to be too hard to fix.
Otherwise, the glitziness will be hard to get used to after the years of Halloween-Goth, but nonetheless it's very nice to see an update, and modern forum software. Nice work.