Strange yellow box on desktop
Hello
I noticed the other day that a small yellow box as appeared behind the apple symbol in the top left of the screen on desktop.
When i click on it it just opens the 'about this mac' options.
I have ran a virus scan and it says its all clear
does anyone know what it is and how I get off my screen. I have attached an image of to help. It also appears when the computer is locked (password) screen but appears to have a 'M' in it and a small pointer (mouse cursor)
Cheers
MacBook Pro, OS X Mavericks (10.9.1)