Twice now when my roommate is home, I get the result "No renderers were found." Whenever he is not home, PS3 Media Server works absolutely flawlessly both wired and wirelessly. In Traces, I see "The server should now appear on your renderer."
The Playstation has a dedicated IP address, and of course all the permissions have been given through the firewall and antivirus. Like I said, it never fails to find the PS3 unless my roommate is home, so I'm assuming one of his devices is causing a conflict? But my networking knowledge is paltry at best.