When you click the S or M buttons on a track, it will solo, or mute that one track. If you hold CTRL and click these same buttons, it will unmute/unsolo the other tracks you have already selected, and only solo or mute the one track you just clicked. However, when I click on S or M, without holding CTRL, it will solo or mute the entire project. Holding CTRL and S or M, still functions the same, but now I can only mute one track at a time and can't solo or focus on multiple tracks at once. The program was not doing this 30 an hour ago. I have no idea what I pressed or clicked, that changed this is the programming.