Correction to my prior comment:  When I mouse-over the controls, the grey bar 
appears every 1 to 5 times.  Never more than 5 tries before the bar appears.
Another observation:  When I un-maximize the window, as I said, I can 
mouse-over as many times as I want and it won't cause the grey bar to appear.   
This is true even when I stretch the size of the window to its full extent as 
though it were maximized, but still not in "maximized" mode.   That makes me 
suspect that the problem is not in the nVidia driver, because I find it hard to 
believe that the driver would know whether the state of the window is maximized 
or not.   I haven't studied the compiz code at all on this matter, but it's my 
hunch that maximizing/un-maximizing a window is the function of the window 
manager, not the graphics hardware driver.  In any case, this observation 
should be another clue to the developers.  Also, usually the grey bar 
disappears and the colored title bar restores to normal when I pull the mouse 
pointer off of the controls.  However, sometimes I can pull the pointer off of 
the control and some or all of the bar remains.  I can mouse around the window 
and the grey bar stays, until I mouse over the controls again and move off, 
then the bar disappears.  So, sometimes the bar has persistence until the next 
mouse-off event.

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Title bars on windows disappear every 7 times the title bar text changes
https://bugs.launchpad.net/bugs/152493
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