I wish I knew what to call it.
It's a rectangular area of pixels that get disconnected from my desktop.
It happens when I browse a file menu sometimes, the rectangle area shows up at the same place and same size.
Like if I click edit on a web browser, maybe the rectangle will take the shape of the edit menu, and until I re-click the edit menu, I have this rectangle void that has strange properties.
Sorry I wish I knew how to explain it or even knew what to call it.
It's in the upper right side of the picture I posted on here.