Hi Michael, let me chime in here...

I have added a few screenshots of the behaviour I am seeing:

- screenshot "example 1" shows the overview of all 4 viewports
- example 2 shows what happens when you press the spacebar when the mouse focus is in viewport 1
- example 3 shows what happens when you press the spacebar when the mouse focus is in viewport 3
- example 4 shows what happens when you press the spacebar when the mouse focus is in viewport 4
- the only viewport that shows the expected behaviour is viewport 2 (I did not add a screenshot of that one).

I hope this helps in clarifying this issue.

Yves