I've gone back and forth between 1.06 Stable and 1.07 PB several times now and each time 1.07 PB S/PDIF stops working upon load of the first profile after boot. Each time I go back to 1.06 Stable S/PDIF works as expected. I also use S/PDIF exclusively so I'm blocked on 1.07 PB in its current version.
Cheers,
Mike