I have a main site (named Portal), and within that site is a Enterprise Search Center. On the Search site, there's the usual "All Sites" category. I have added a "People" search page, and an "Internet" search page. From the main site page (Portal), if I do a search for a person (or anything really), the first "All Sites" search category displays the correct information on the search results page, this includes a people search web part and a site search web part. If I then change the category to "People" (even if I'm actually searching for a person), the page displays "No people results matching your search were found." Changing the category to "Internet" works fine as it should. Going back to the "People" search category, if I then click on the blue magnifying glass (in otherwords, perform the same search but in the "People" category), there will be search results even though the search words haven't changed. If I do the same search, but perform the search initially from the search site homepage, all three search categories work fine. I'm not entirely sure what to try, other than removing the "People" category and adding it back on (which I've tried).