I noticed that the High-Bandwidth Digital Content Protection is blocking the video signal from you Slingbox.
Feel free to check the recommendations on this link in order avoid this issue:
Also, this link will explain to you why the Sling Media products don't use HDMI:
I hope this helps.
I read those two articles and have yet to try it. But was wondering if slingbox was going to step up and fix this with updates or not. Its no different then saying i can watch movies on vhs tapes cause updating to DVD's is really exspensive. Makes me wonder if things like this is a way for the T.V. monsters (cable/satelite companies) to make more money.
It is a very known problem. I wrote about it here: https://community.sling.com/message/59786#59786
Most of the TV sets in the stand-by mode do not support HDCP. That's why your set-top box detects that there is a non-HDCP-compliant device connected to its HDMI output.
Most of the set-top boxes and satellite decoders block all their outputs (YPbPr, SPDIF, SCART,...) when detect such a non-HDCP-compliant device connected.
The simplest solution is using active iHDMI cable instead of the passive HDMI cable. Here is link to such cable: http://ihdmi.eu/cgibin/shop?info=8ihdmi18