Forum Search problems
 

I recently upgraded to 4.0.1 from 3.8 something.
Under search options, my minimum string length is 2 characters.
But, when a user does a forum search for some terms, the result is empty, even though that term is used. For example, CWP is a common term in the forum, it is in lots of titles, but a search under CWP returns no matches. But a search for math returns matches. I have rebuild the search index but it still does not return any match for anything 2 or 3 characters long. Even when I put the search term in quotes, as in "CWP 6"