OS X package UID is a login user
In the OS X installer, a user is created with a uid of 503 (the 500 range, anyway). UIDs in this range show up in the login window/fast user switching, which isn't right for the tor user.
UID=103 seems OK here, or perhaps sub 100? I haven't been able to track down any actual documentation on the ranges, will try to find some and update this.
[Automatically added by flyspray2trac: Operating System: OSX 10.4 Tiger]