I just bought a new tb13" with Sierra and I'm experiencing reoccuring problems with the thumbnails for the desktops show in mission control not showing the open applications correctly. As you can see in the attached picture below, the background of mission control is shown instead of open applications. This is despite me having open applications on all desktops. This problem temporarily fixed when restarting but soon thereafter happens again. Has anyone here experienced a similar problem and has a solution?