Having issues with Adobe Photoshop CS4's eyedropper tool? It's a new feature in Photoshop CS4 that I may some day find useful, but the default setting made me think there was a problem with my installation. When you have the eyedropper tool selected and you're trying to select a color but it doesn't take, verify in the "Sample Menu" (this is the bar at the top where you find tool-specific menus) that it is sampling "All Layers," not only the "Current Layer."