@kristianity77; my 1.0X firmware did not fix any vSync issues.
The fact that you did not notice any issues with 1.0X firmware makes.. we'll your feedback less than creditable (as all S7800B units had choppy / frame drop issues on X264 video playback). The fact you didn't notice this is awesome (for you), but bad new (for me). I hope that makes sense.
Actually it,s hit and miss.
The 78's have problems with h263 also (divx/xvid) in 360/480p
Yet I have a 1080p copy of night of the living dead in h264 that runs just about perfect.
I don't think the issue is an under powered CPU, the hardware decoder should handle most of the heavy lifting on that anyway.
As for the DRM I seen a setting in dev options to disable HDCP iirc it made no difference on or off but I'll double check tomorrow.
Kris is credable , they was the first to notice the HDMI issue.