Hey all i'm here for photoshop and I was wracking my brain as well with this eye dropper thing. I was messing around with the new 3d settings and found out that my preset for eye dropper was set to only 3D. Had to change the hotkeys to include both (customize toolbar). Hope this helps anyone else that happens to have done the same.
Branched from Re: eyedropper tool not picking up color (InDesign)
Moved from InDesign forum to Photoshop forum
Title edited to reflect Photoshop instead of InDesign