Image distortion on startup
Hi,
I seem to be getting a strange problem on startup. As I hover my pointer over the "Guest User login", the background on that image turns dark wherever my pointer is. I can't seem to understand what the problem is. I turned off the guest user by going to the system preferences but it still shows.
Is there something wrong with my Macbook? Please help.
Macbook Pro late 2013 retina model. OSX El Capitan v10.11.4
MacBook Pro (Retina, 13-inch, Late 2013), OS X Yosemite (10.10.2)