Substring is killing Search in one RH8 project

Here's a new one:  When I select the "Enable Substring Search" option in WebHelp, the published version Search is inoperable.  That is, the Search looks OK, but never produces results.  Any recommendations on how to fix this issue?

While I'm on the subject of Search, I recently performed a search that produced for me a link to a document that was used in the days of yore.  I have no clue where WebHelp is pulling this document from, therefore I have no clue how to remove it from the Search.

Did I mention we just upgraded to RH8 from RH7 this week?

Any help is greatly appreciated.