I did notice a couple of wierd little bugs (minor of course) in the last couple of days with channel audio, but I haven't successfully replicated them.
Sometimes when going from an ITC channel to a Scrambled channel, the audio from the first ITC channel would play on the scrambled channel. I'll try to replicate this, but it seems to happen when i hold the "channel up" button down to get through a lot of scrambled channels. I don't remember which satellite or what channels it did it on, but I have a feeling it was when going from a channel with both audio and video, to a channel that had no video, but did have audio (but not considered a radio channel) if that makes sense.
the other thing i noticed was that I could make the receiver crash if i accidently press select an MP3 on the jump drive. receiver choked hard.
I also noticed that when switching channels in the EPG and selecting a different one, if i press exit on the guide it switches back to the original channel.
Of course, these are all minor bugs, I LOVE this box! I plan on getting the DVR version soon!