Being that you have the Slingbox 500, are you connecting the Slingbox with HDMI cables. If so have a look at the following article:
For more details on how to resolve this issue, have a look at the following article:
- When I connect my set-top box to my TV with HDMI connections, I can't stream video at all using any version of SlingPlayer. Why?
What this article is entailing is to remote the HDMI cables from the cable box completely and just run Component cables from the Cable box to the Slingbox, then another set from the Slingbox to the TV. This will eliminate the copy right protection that you are experiencing and will allow you to view the Slingbox with your home Television off.
Hope this helps!!
Sling Media Moderation Team