I see you have a Slingbox 500. Do you have any HDMI cables attached to the Slingbox or cable box you are using? If so, you could potentially run into HDCP or SOC. Essentially, the content gets blocked by the cable provider when the cable box detects another device that is not a TV. Below is a few articles I would like for you to take a look at. They further explain what is going on, and how to fix the current issue.
- 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?
- Using an HDMI video source with the Slingbox 500
Sling Media Moderation Team