I noticed this on my iPhone 4 just the other day and didn't think much of it. Then I was using my wife's iPhone 4 and the issue seemed to jump right out at me.... now I can't ignore it! Is this a glitch in iOS4 or the iPhone 4? When using a lighter background on your home screen, I notice a quick flicker in the background when swiping back from screen 2 to screen 1... it's pretty slight, and is more noticeable the lighter the background is. It doesn't happen on any of the other screens, nor coming back out of Spotlight. Obviously not a big deal- I usually have a dark background up anyway but I'm just curious if other people are seeing it. EDIT: oh yeah, obviously it's an iOS 4 thing since we didn't even have wallpaper before... duh.