It's a minor issue with C1-3 recording no audio if you do not turn it to M or other modes first. Starting up in C1-3 will have no audio recorded. Shows you how often people shoot with C1-3 that the beta testers didn't find this.
I'm moving this as it should stay under the firmware so people can find out about this while searching.
That's a big deal. I use C1 and C2 to store my jump settings for stills and video -- would suck not to get audio! Good to know.