the only thing I notice right off is an error trying to find a js file:
“NetworkError: 404 Not Found – http://forums.shopcreator.com/forum/infosite/topic-1/js/script.js”
so either the wp theme or another plugin js is adding that include to the forum page and it wont be found… any idea what might be doing that…
so first, verify what Andy asked… and it still problem, can you try a quick temp change to the default wp theme and see if it functions any better? just trying to narrow down things…