Hi Dave,
Do you have settings like this in user.config?
<add key="DisableSearchFeatureFilters" value="false" />
<add key="SearchUseBackwardCompatibilityMode" value="false" />
<add key="EnableSearchResultsHighlighting" value="true" />
<add key="SearchIncludeModuleRoleFilters" value="true" />
What version of mojoPortal? You can check at Administration > System Info
Do you have a lot of roles in your site?
Do you get the same results when you are signed out of the site as when signed in?
Best,
Joe