HDMI audio problems are usually little "pops" or "tick" sounds. Years ago I had a very expensive pre/pro that had HDMI audio problems - little "pops" and "ticks". Turns out one of the internal ribbon cable suppliers sold them cables that weren't up to snuff, at least that's what I was told by their tech guy. If not a cable or cable seating problem, it could be the receiver or even the BD player.
If a cannibal eats a clown, will it taste funny?