It seems to be happening randomly on both win 8 and 10.
I will notice that a buss will stop sending stereo out. I did find the fix.. but I keep seeing it..
but I can turn off or mute the buss or delete the buss and the problem goes away until a fresh boot with a previous project. (randomly)
 
 

Hi. Is this happening on one or more projects? New or old project(s) Have you tried to do a save as, to see if it could clean up any issues?
All the best.

hello,
No, I have been testing only... well... You got me thinking... ha!
 
I've been using older projects and adding a track template of drum tracks. Nothing new recently just these two different projects. Hopefully its just a glitch in the track template with the old project files.
 
thank you! :)