I can't explain why this doesn't work for the couple of people on this thread.
There are now a fairly large number of Q10 Pros with customers and we are not getting more general feedback about this, so it's only a problem for a small % of people. It 100% works for us in testing, we can't replicate the problem. HD-Audio passthrough is flawless. We have a Denon AVR1610 and a Denon AVRX520BT.
We're need more data / user reports. I had hoped that if more people did post on this thread then they would have similar setups and the problem could be narrowed down to a particular amp or brand of amp, but the two cases so far are from a Denon and Onkyo.
In general, please check HDMI cables and amp/TV setup. It's always possible that it's cable or setup related.