DCP-o-matic

Everything has been fine until recently when my audio stopped working on my machine after a windows update (nvidia HD audio) I updated my game ready drivers and audio returned. Today i went to make a DCP and discovered that audio wasn't working in dcp-o-matic. It wasn't my source, an MKV rip of a bluray disc. Using the test audio levels tool, I could see the audio track was there, but I want to make sure audio is good before trying to transfer it over to the GDC server, which is a timely process in my current workflow.

Any ideas why I don't have audio?

Win 10, current release, most recent release of dcp-o-matic, most recent nvidia game ready driver package, audio routing from gfx card over hdmi and into my LG monitor, which outputs to my studio speakers.

and yes, I have audio turned on in the player

What does it say at the top of the "Sound" preferences page?

its pointing to the proper audio device as it always has been.

Could you check that you have a debug log file configured in the player preferences, then start the player and attach/send me the log?