I also have the no audio problem with a couple of twists.

I see it when I use my Directv HD DVR. About 20% of the time when I fast forward and stop I get no audio. I simply go to pause and try again and it works. Polling is off and the standard settings are used for DD. I also get two other alternatives. First, about 1 in 20 occurances of audio problems I will get a distorted audio. Second, in about the same interval, I'll get a white noise audio output (scares the hell out of you). This is the same sound you get when you try to play a DTS cd on a non DTS player. Basically no decoding of the signal.

The no audio problem is there all the time on live Directv as well. If I switch between DD channels and Pro logic channels, no audio will occur as well in about 20% of the time.

I have seen the no audio on the dvd player, but not as often (I usually don't stop and start the dvd player).

This problem is getting frustrating. I added the new FW with no improvement.