Project window loses focus on stop

So why would this be?

This problem still persists…
I have two projects side by side in N7.
One behaves itself correctly - the project window keeps the focus, so I can perform multiple PLay/Stop/Rewind/FF functions and each works correctly.

THe other has randomly changed its behaviour - after a keyboard input, the project window loses the focus. Now keyboard input does not work until I click on the window, when it regains focus, but only until the next keyboard input…
Anybody have any thoughts on this conundrum?