multi-user wordpress and fast-cgi

hi – sorry to post a question that probably has been asked at length, but i am on my way out the door, and ran out of time to properly research this one.

does anybody have any instructions how to set up multi-user-wordpress in a fast-cgi environment? i can get the primary website up and running no problem, but the “child” websites i cant seem to get working. i keep running into suexec policy errors:

[2013-02-19 15:05:51]: uid: (608/CHILDWEBSITE.com) gid: (595/CHILDWEBSITE.com) cmd: php5.cgi
[2013-02-19 15:05:51]: target uid/gid (608/595) mismatch with directory (543/537) or program (543/537)

any help would be VERY much appreciated!