I realized I left one piece of information out. I was using the obsolete Slingplayer executable (v220.127.116.111) to detect and then manually install the the updated firmware. While the Windows Slingplayer executable thought I was running the latest version and also thought the binary I had was bad, the web app thought differently. It immediately realized the firmware was not up to date and downloading it without me having to force things.
So life is good, the WD TV Llive is talking just fine now with my HD Pro.
Glad that worked for you.
I still have the WD-live but I found another solution you might be
I still use the WD-live for streaming from my media centers, etc.
But with Slingbox as you know, there is a delay when you want to
interact with the Set-Top-Box.
I started experimenting and evaluating Wireless HDMI
I've settled on a product from ActionTec.
You might have a look-see at what they offer. I realize that it may not
be applicable in your particular environment.
I have heard that audio can be a blocked by some cable STBs. I use
DirecTV and have no issues.
The ActionTec has a transmitter which can support up to 4 receivers and
the device handles HDCP.
I had some issues early on with multiple receivers, but I'm now a beta
firmware tester for them.
The latest beta firmware is pretty flawless.