Reinstall HDMIAudio once or twice and see if it helps. I found that sometimes it takes a couple tries before it will actually take hold.
thanks for the speedy reply Zorn.
Based on your suggestion, should I be installing then uninstalling the hdmi audio (as per original post instructions).
Or should I just be installing (clobbering) one install on top of the other until I get the result I'm after?
Likewise, do you suggest I use version 1.0 or 1.1?
Also, should I be punching in the following command before or after each install;
sudo nvram boot-args="kext-dev-mode=1
such a shame this hasn't been fixed by Apple with the 10.10.5 update...
regards,
Liger Megatron