I am using Photoshop CS4 on a new ultrabook running Windows 8. My video card is up to date. However, on this computer I cannot get the background to show up white. It shows up off-white or creamy. I thought it might be the screen, but the images print with the creamy color. I reset the color picker to 255-255-255, and also reset my preferences. No dice. Ideas? Thanks in advance.
Usually this just means that your display profile doesn't match your actual display.
You'll need to recalibrate or select a more correct profile for your display in the OS settings.
(this is not a Photoshop color issue)