Sherlock Channel developers:
If you've update to 10.2.4 you must set the environment variable "SHERLOCK_DEBUG_CHANNELS" to "1". It is recomended that you use this Tech Q&A to do it. The update may also have reset your server and/or its httpd.conf file (if you don't know what that files is, just check that your server is running in the "Sharing" Preference Pane).
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030214131318488