First off, the move up, down, to front, to back isn't as good as just the number slider that was in the previous version, but the actual bug is that those buttons just don't work for me, hit areas occasionally highlight, but even then don't work. I've a project file with many layers that I constantly need to move layers up and down and change the opacity of lots each time. This new app version has killed the functionality of that, where once it worked great. Definite step backwards on layer control.