A friend of mine ran into a weird issue.
He upgraded from Mountain Lion to El Capitan, and after doing it, his Focusrite USB Scarlett 6i6 interface stopped working, BUT ONLY with Cubase (he is on 7.5). Other apps like Garage Band or Adobe Audition, and even the computer sounds, all run smoothly on this interface. He went to focusrite and they told him: “go to Steinberg”. So here we are.
What happens is, no audio shows on the channels nor stereo output meters, upon playback.
I checked his setup and everything is fine. Sample rate is the same on both interface setup and cubase project setup, VST connections are correct, the control room is disabled, the driver is selected and the busses are also selected on the tracks. Start playback, and the audio just doesnt show on the meters. Change the driver to anything else, and the audio flow works just fine.
I even tried swapping the interface, and plugging in another one of the same generation (Scarlett 18i6). The issue persists. So, it seems there is an incompatibility between focusrite USB 2.0 interfaces and Cubase 7.5 running on El Capitan.
Any ideas on how to solve or troubleshoot this?
He has even reinstalled Cubase 3 times. No luck either.