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It appears that you may have encountered HD copyright protection on your Motorola DVR. To ensure placeshifting capability for your video signal, we suggest hooking up component cables in addition to your existing HDMI input.
Here is a Sling knowledgebase article with more information: http://support.slingbox.com/get/KB-2000491.html.
Also, a video we created that explains digital copy protection: http://youtu.be/Ks73F6KON5U.
Please let us know if you are still experiencing issues with your audio and video after following these steps.
- Brett, PM @ Sling