I have a Studio 192 mobile interface, Win10, and S1 4.6 professional..
When I switch between (Alt-Tab) i.e. YouTube/spotify etc, and StudiOne, The other apps becomes silent until I place UC in the forgrund. I see the VU-meter move, but no sound. When I touch the fader, the sound comes. Switching back to S1 works OK. It seems to be intermittent. Now and then it works.
Any reason for that? - Some settings I should look into?