Hi,
I updated to the new beta to solve the CPU issues I was having, and I can say without a doubt that it's much better than before. My laptop is running cooler than the previous version
The problem I'm having is with the audio drivers. I usually have the "speaker fill" enhancement turned on so that music in iTunes comes out of all five speakers instead of just the left/right stereo channels. Since installing the new beta however, my rear and centre speakers have been deadly silent.
I have checked that "speaker fill" is enabled, and it is. I have also tried disabling it and re-enabling it, but that makes no difference.
Any ideas?