When Zoomed In To 600% I Get A Grid Pattern...
Im using Adobe Photoshop CS4 & when i zoom in to 600% or more i get a white grid pattern (as you can see by the screenshot i provided). I zoom in that much to do precise work &/or adjustments & with that grid in the way at 600% zoom its just right in the way. I havent used CS4 long so is that normal for it to do or do i have a glitch or something?

Thank you in advance for any & all help 
