This is the problem that brought me to the forums. I’m not sure if it’s a different issue or not. For me, when the midi key editor gets focus, all of my audio stops. When I click back on the project window, I get my audio back. As near as I can tell, the issue just started for me with this maintenance update. I’m running Win10 with Cubase 8.5.1 pro.
EDIT…
I just discovered my problem at least. A newbee mistake from a long time user. Hopefully it’ll help a couple of you.
At the very top left in the key editor (midi and sample), there’s a button called “solo editor”. It’s an “S” within a circle. If that’s selected, and in certain circumstances, it will mute all of your audio when the editor has focus.
PHEW! Back to mixing.