Symptoms: 

On some installations with slower computers, or computers under load, clicking between tabs on a tabbed view layout may have delays or missed clicks.  This can happen with Mimo devices controlling larger screens.

This issue is caused by a combination of a loaded CPU and the display order of the tabbed device being set to "Always on Bottom".

Resolution:

In Settings -> Display -> Fullscreen,  set the Layer of the tabbed layout to "Normal" if you want other application messages to appear, or "Always On Top" if you want the Quicklaunch to always be on top.