I bought a Vizio XVT3D474SV with Internet Apps and whenever the TV is turned on it basically disables my Slingbox Classic for both Internet Viewing and local discovery.
The network light on the Slingbox is still a steady green but the device will not work or reply to a ping.
When the TV is turned on it also disables the VOD capability of my DirecTV DVR, it still shows network access but that there is no Internet Access.
Any ideas on what kind of a conflict it is, Vizion Internet Apps supposedly only uses ports 88 and 443.
I understand that you are having some issues with your Slingbox Classic, since it turns off when you us the TV set.
This issue is related to the HDMI connection. The following link will allow you to get the steps to follow in order to fix this issue.