Blocking pin 13 or using a CEC blocking HDMI adapter is the solution, as mentioned already.
HiMedia have tried to fix this, and there are reports in the 2.0.3 and later firmware threads of the fix being successful for some users, but it seems to keep coming back for some users / setups. I will add it again to the 2.0.4 bug list and send to HiMedia.
I've also added it to the FAQ to try and avoid multiple threads.