Cubase not remembering window position when switching apps and coming back to it
Check System Prefs > Mission Control &amp; see what you have for 'Displays have separate Spaces'.
My guess is you have that enabled. 

Cubase doesn't really use the Mac's Saved State because the state is really in the project file, or in your window sets, so I don't think it's the issue. I'm guessing it's because if each display is a different Space, you're moving one app to multiple Spaces… which isn't good. 

Toggling that setting can really muck up your workflow &amp; you have to re-allocate everything back to its correct Space, so I'm not going to do it just to test ;)