Forum Search not working right
 

I just upgraded to 4.0 from 3.8. A user reported "[IMG]file:///C:/Users/Peter/AppData/Local/Temp/moz-screenshot.png[/IMG][IMG]file:///C:/Users/Peter/AppData/Local/Temp/moz-screenshot-1.png[/IMG]When I search a keyword, I seem to only find posts that have been added since the board changed. I get the same result if I go to a users profile page and click on "show all posts". Apparently, the search feature does not seem to be accessing the archive."

Can someone please advise? Do I need to rebuild the search or something?