I have installed the forum and it works perfect. I have changed my default theme to Foundation. Added the additional css forum info to the style.css and my forum is garbled.
You can see it here

My Forum

I'm not sure what is going on, for the professional theme adding the extra css to the style.css worked perfectly. I dont really want to have to stick with Professional all the time, any clues, thanks.

updating to the Forum 2.5 release candidate helped me out tons. Problem solved