F.Y.i the drivers from 17-07-12 give you working power vu channels but of course this is not how it should be done.
Yes, you are right, sound is available on recording a power vu channels but not on normal view. Very strange, problem with drivers as you said.
I have the same problem on power vu channels but I start to believe that the problem is the TV which is a LG Olead. Which TV do You have?