Cannot change Play in New Editor Window settings in upgraded 4.11 to 4.12 project

This is really ticking me off and I want to know if I am missing something simple. I have an upgraded project that, no matter what I do, always launches a 1080p window with a left offset of 1920 when I do a “play in new window”. If I change any of the settings in the Editor Preferences, they always reset to the 1080p, 1920 offset as soon as I hit play again. If I create a new project, it works fine (the window starts where it should and I can change the settings).

Anyone else seeing this behavior in an upgraded project? Any recommendations on where this setting might be getting locked down?