Yep, the buttons are too big. Like the forum colours though. You may consider some animation as this is what fantasy is made up of...
Now i can open it. 1. Forum background need to fit the content. 2. Menu item is big. Color is simple.
How much traffic does your site get? Also is it a profitable niche adsense wise? How do you plan on getting members?
I think site is good, I am not an expert, but I am sure A true Harry P. reader will love it. well done!
The colors are bland and seem washed out. When I think of Harry Potter, I think of old brick, old wood, old forest, etc. Your header is nice, but I'd like to see a little more of that theme throughout the site.
How are you getting your traffic? What keywords are you ranking in to get traffic from? I am thinking of starting a HP forum like a real big one and linking to you if I can find out this info! Please do PM me if you could with such infos.
I think if you can add some more images in your site then it would be great to look at . I am a Harry Potter fans so I think it is much better if you can see photos as well or images so it won't be that bare to look at.