[Ben Jenssen]

Originally Posted by cwsand

I've never even used Window Configurations. On Mac, if you just make the window smaller than the full screen, then Option-click the green button at the top left of the window, it should maximize it. Save and reopen the session should bring the windows back onto the correct monitors. Works for me at least.

It's a kind of fix for size of PTs windows (PT not remembering full screen), but I've yet to find a fix for OPs issue; both mix and edit windows will always be on the main monitor on session open.