My client's site is currently on DNN 7.03.00. Not sure when it happened, but they noticed that the Site Search returns no results, whether used from the header or on the Search page. There are no error messages, just "No Results Found."

I've tried re-indexing Host content, Re-indexing content from Search Admin. I've checked that the site has a primary Alias selected. I've not been able to find any other suggestions for getting search results back. Help!