Set up = Analog in 1&2 on Focusrite Scarlett 6i6. Output from Scarlett to M-Audio CO3 Digital Converter. From the CO3 I send the digital signal via Optical to my amp and a digital signal to the SPDIF input on my M-Audio Fast Track C400 interface which is connected to my Windows 10 computer via USB. It sees the SPDIF output in OBS Studio but when I select it, I get no audio. I"ve had this setup for awhile and it was working just fine. Not sure what I have done or if the issue was caused from an update, but I have tried as many configurations as I can come up with and the only way its letting audio into OBS is via analog inputs. I want my SPDIF working the way it was. Can anyone tell me whats caused this or has anyone had any similar issues with digital inputs into OBS studio. Thank you