KDE Help Center Search Index

Hi, My KDE Help Center no longer has any search indexes. When I try to rebuild them, the list from which I am to select which documents or document categories or document collections (or whatever) is empty. I thought perhaps I should try running the Help Center as root so that it could write the indexes, but I cannot figure out what incantation to give to kdesu to do so. I used pstree to see what the name of the Help Center program was, but can see nothing there that would correspond to that window, which is open. Any help? On either of these questions? Thanks. Randall Schulz