It seems that since the Dish Network purchase Sling is now blocking video out to slingbox PRO HD if HDMI is used to connect your TV. You must use component all around. I have to re-wire my entire home entertainment system because I have "upgraded" to the latest slingbox. The older PRO model worked fine with my setup.
Hi, sscheid and jlynch3
The main issue is that none of the Slingbox models will work with the HDMI cable. If you are using this cable, you will need to remove it and use Component cables instead. The following links will provide you with all the information about this situation.