We tried this on 10.12.4 Sierra, creating multiple views in the CoV window, making changes to these views, closing out, and we are able to double click and access the parameters.
Are you by chance using a second monitor? If so, does this happen if you disconnect the monitor?
Or perhaps do you have multiple Spaces active on your desktop? If you have only one Desktop space and try it again, do you still get the same problem?
Between the View Parameters and the Material Parameters it sounds like perhaps these windows are not opening on the proper screen, or behind the project window.
I wish it was that simple. Like I said, right clicking and hitting Edit that way, works fine, so the Window is not being lost or anything.
I have 3 monitors, always hooked up to my Mac Pro, they never get disconnected.
I do not use Spaces, just the 3 Desktops, one for each monitor.
Something is happening after leaving the CoV window, because it works as expected with the double click before going in there. I've also noticed that the Palette Dock resizes itself (too short) after leaving the CoV, so it's not remembering it's proper last 'state'. Perhaps that is related?