TaskBar set to hide, will not unhide

I have my taskbar set to hide. When I move my mouse to the edge of the screen, it will pop out sometimes and sometimes it is necessary for me to size-down the program that fills the screen, move the mouse to the edge of the screen again and it pops out but goes behind the program that partially fills the screen.

This has me believing the taskbar pops out all the time but behind whatever maximized program is on the screen. This behavior is not restricted to one maximized program and is sporadic.

See screen shot.

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