Thanks. In answer
W7 64, Radeon HD6870 CCC 12.1, and CCC says up to date - which seems odd since CCC is on 12.10?
HDMI from GPU to TV, RCA from Asus Xonar Essence ST to amp
RO HQ
this behavior with mkv only so far (its what we use)
odd stability issues - the grey background around the Windows Orb sometimes is black and only turns grey when moused over, sometimes when mounting an iso to create an mkv with makemkv, makemkv cannot seem to read the iso and it hangs. I have noticed that my wireless keyboard now is sometimes unresponsive other than the Windows key
the video problem happens seeming every time we play an mkv, so is making MC unusable at the moment. The picture and sound will stop and screen goes black, pressing play again twice resumes audio only, sometimes not and I need to hit the Windows key to allow me to access task manager and stop MC; then restart MC and resume my viewing
i can pm a log - to who should i send it?
Many thanks