I just figured this out while I was playing with the settings. There was a white stripe on the bottom of the screen, also a bubble of white on the right bottom corner. After this "tweak" the bubble completely disappeared.
Apple menu
System preferences
Universal Access
Set contrast before the first mark, half way to it.
BAM, screen looks much better, and where's the white bubble? Disappeard..
Apple menu
System preferences
Universal Access
Set contrast before the first mark, half way to it.
BAM, screen looks much better, and where's the white bubble? Disappeard..