Are you on MacOS? I am and a similar thing happened to me, very confusing. It turns out that Apple likes to release OS updates that turn one audio device into two audio devices - one for input and one for output. Crazy, I know, and definately a bug in my world but hey, it’s Apple. So go into your system settings, find the ES-9 audio device, and see if it is now two rather than one device. If it is, make an aggregate device (e.g. “ES-9-united”) from the input + output ES-9 devices and voila, normalcy is back.