[ayeroff]

I've been using Kodi DSPlayer for a couple of years now, and had my HTPC running pretty well.  I use my HTPC exclusively to play Bluray and UHD MKV files ripped from my movie disc collection.

Recently, my NVIDIA driver got updated accidentally (I've avoided updating most drivers once I got my system working the way I wanted) which started causing some problems.  So I downloaded my previous NVIDIA driver and rolled back to that version (390.77).  Everything is working again, except I can't get my system to play any lossless audio (Dolby TrueHD, DTS-HD MA, or Dolby Atmos).  Now, when I play a MKV movie that has Dolby TrueHD, DTS-HD MA, or Dolby Atmos, I get no sound from the movie.  If I play a MKV movie with DD or DTS, the sound plays fine.  I have WASAPI selected for both direct and passthrough, and all audio formats supported by my A/V receiver (Yamaha RX-A2070) are selected. 

Any idea what might have gotten broken during the Driver rollback, or how I can get lossless audio to play again?  Thanks for the help!