There are 4 ways to search on Kappa Performance.
1. Above the menu there is a seach box - type directly in there and click Search
2. Next to the search box is a magnifying glass - click it and you have an advanced search feature where you can search in a particular sub forum or by a person's user name.
3. Click the Forum from the menu and in the Google search, enter what you want and Google will only search within KappaPerformance - This is really a great feature.
4. From any seach engine type in what you want and include - site:kappaperformance.com at the end.
If you are searching for posts from a member, click members, search for members, type a portion of their user name and add a * and then the forum will list the names, click the member of your choice, then click show posts on the left.
I have submitted a problem request to the SMF staff and they said there isn't anything I can do with the search issue. They're not sure where the problem lies.