CS5 has bad color, and cannot see light tints. The computer used to be a freelance computer, so all the settings were probably messed with. so far I
CS5(left, CS6 (right) background has dark pink pattern
Made with spot channels in photoshop. Tried flopping the swatches flyout for spot colors, between lab use cmyk, use lab.
File looks fine on other computers, just bad on mine. Tried making a new user account, and that looked wrong also. Must be something that affects all users accounts. Since it works in CS6 I assume my calibration profile (made with i1 Dislpay Pro ) is good.