One thing you might want to

One thing you might want to try is to change out your HDMI cables.  I had an incident recently where this popped up with a short HDMI cable (Gefen branded 1-footer that came with my HDMI Detective).  Before I was using a longer cable and had no troubles, then one day decided to use the longer cable to connect my Xbox360, and use the shorter cable from HTPC -> HDMI Detective, and then started getting HDCP errors.  I’ve heard that about HDMI cables, especially short ones, swapped it out for the longer one again, and so far the HDCP errors are gone.

Something to try…