I often work with multiple files at a time to create buttons and such. I have a reference file and the files that I need to make changes to. In CS5, I can sample colour between the various files but in beta I had to resort to copying and pasting the colour code. Had the files tiles side by side. Not sure if that makes a difference.
Howdy. I opened up two photos in CS6 and tiled them side by side and added a new layer to the first one on the left. When I select the eyedropper while the left picture is active, and then click on a color on the picture on the right, I am then able to select the paintbrush and paint with that color directly on the left picture. This is the behavior I would expect. Is this what you did? Can you try the exact same thing and see if it works for you? It appears to work properly here.
Europe, Middle East and Africa