I'm facing this graphic bug:
It's always at the bottom right of the cursor. Not the mouse. Whenever the cursor is not moving on the editor, the graphic bug pops up like intellisense, and it doubles the android studio like in the picture.
I'm using AMD Radeon HD 6800 Series graphics card. And using AMD Catalyst suite version 15.201.
Try adding "sun.java2d.d3d=false" to "Android Studio\bin\idea.properties". This worked for me.
See here: Android Studio is having a strange "cascading display" glitch?
[edit: spelling]