Turn off the perspective grid in Illustrator CS5
This is what will sometimes appear on your screen.
For the past few weeks in using Illustrator CS5, it has come to my attention that a very consistent problem kept coming up, the perspective grid.
If you use the key command Shift + O to modify your art boards you may sometimes hit Shift + P instead, by doing so it will add a very intrusive grid on your screen. It’s not very clear how to remove this massive distraction at first glance, so here’s how to do it:
View > Perspective Grid > Hide Grid
Mac Keyboard Command:
Shift + Command + i
Windows Keyboard Command:
CTRL + Shift + i