I'm losing audio to my monitors at anything above 128kHz sample rate.  I can still monitor just fine via headphones.  Checked the FF mixer, and it shows that audio is going out to speaker L/R, but I can't hear anything.  Switch back to anything under 128kHz and it comes right back.

I'm connecting my monitors via SPDIF, for what it's worth.

Any thoughts?  Thanks in advance for the help.