launchd WatchPaths not triggered by CGI file change

I'm posting somewhat off-topic here, since I'm using Mac OS X client instead of server; but the reason is that I found extensive information on this site about the subject that brings me here today: launchd. Please feel free to move or delete this thread if it violates the rules. I have a Launch Agent watching a directory (WatchPaths). When a file is added, removed, or altered by user interaction, the Agent is triggered. However, I need it to be triggered by updates being made by a CGI script -- which it is not currently doing. Mac OS X 10.4.10 Client Intel Mac Mini 2.0