[John Paget]

I have a similar problem. Was shooting today with lav mic input on Channel 1, and camera mic set to channel 2. While shooting, I could hear both mics. On playback from the camera I could only hear Channel 2.
Switched the lav mic input to Channel 2 just to make sure. Same thing, heard only channel 2.
After importing the p2 footage, both channels of audio are there and recorded OK – so it is clearly just an issue with monitoring / audio playback from the camera.
I searched for any settings in the menu which could affect this – could not find. Seems like you cannot even set the audio playback to monitor a particular channel – not an option – you can only listen to both channels I assume (although I cannot hear channel 1 at all – which means it might be broken?). I am sure I used to be able to hear it.
Strange.