My "Layers" Trey/Panel is always missing. My workaround is to maximize window - green button top left of screen - and then the Trey/Panel appears. I then resize the screen again. I have to do this every time I open the file.

They didn't remove these options in SU2017. They both do work but it might be your graphics card isn't up to the task. What kind of graphics card do you have in your Mac?

Yes, but that box is not checked and it doesn't loop to the beginning. It loops to a scene that is no longer there.