Q: If I press the Window button on my Project Mix I/O while using Apple's Logic recording software, the software interface keeps flashing between screensets 1 and 2; and I can't get it to stop.

A: To prevent this from happening, go the the Logic Menu>Preferences>Control Surfaces and select "Controller Assignments...".

Click the Control F1 to select it (shown below):



Un-check the box "Key Repeat".



Repeat this process and un-check the "Key Repeat" option for the control F2.

The Window button should now function as expected, allowing you to toggle between screensets 1 and 2 with each press of the button.