Which Slingbox (Pro or Pro-HD) are you using?
Which Connection Type (Component, S-Video, Composite, ANT IN)?
During the Setup Assistant which did you pick for "Device" Type (Cable Box, Satellite Receiver, Standalone DVR (Digital Video Recorder), DVD Player, Other Controllable Device, or Non-Controllable Device)?
Manufacturer and Model of the Set-top box?
Do you get the same results from the Slingplayer Desktop or Web Slingplayer?