I just tried pocket audio with my htpc, and it works perfectly. I triggered many voice commands and had no problems with crashing or otherwise. I am using version 0.867 of VC but it shouldn't make a difference afaik.
I tried setting the audio quality on the pocket app on the ipod to low, medium, and high quality, in turn. On low it did not recognize my commands, but it did not crash. It worked ok on medium, but better on high quality... (huh- no kidding)
I will try later on my laptop to see if I can figure out what is going on, but last time it happened I had no idea and just figured it was my laptop's fault... The only obvious difference between the two machines is that the laptop is running win7 32 bit, and my htpc is running win7 64 bit.
One thing I can say, though is that although the accuracy was pretty good, the delay is pretty annoying, especially for commands like scroll ! After you issue a commmand you have to wait a second or two to find out if anything is going to happen. Yucko. Oddly enough, there didn't seem to be noticeably less delay on medium quality than on high quality.