After installing the wp-forum plugin you may notice that the layout looks out of wack. This could be for numerous issues but one I came across was the fact that after unpacking the plugin on the server the main directory permissions were incorrect. If you chown 775 wp-forum in <web-root>/wp-content/wp-plugins/wp-forum this should resolve your issue.
I live in the SoBro neighborhood of Louisville, KY with my daughter and our cat Apollo. I enjoy being challenged by technology problems and am fortunate enough to get paid to solve them.