That does not happen to me in CS5 or CS6 Illustrator on Mac, and has never happened in the past. What happens is the already open Photoshop file is brought to focus.
Do you possibly have CC? I know they added a feature for unembed images, and wondering if possibly you have an embedded image rather than linked. In CS5 or CS6 mac you cannot edit original on an embedded image, but if you could you would theoretically have 2 images looking the same open in photoshop.
You could try resetting your Phothsop preferences, if my stab at this being related to CC has no relevance.
Did you actually do my test? It doesnt work with previous/closed PS files.
I have done it on 4 Macs here in the studio with same result.
This only works on newly created freshly placed images open PS files.
Did the same in CS5 and CS6 10.7.5
Let me know.....
I tried again with fresh new never been saved before PS & AI files, but got the same result. I used the .psd format.
Do you have any 3rd party plug ins on all 4 machines? What happens if rather than using the shortcut, you use the links palette open original? What are the filenames on eh identical windows, are they the same?
Anyone else try this, what results did you get.
Yes I save a "test.psd" file on desktop and left it open.
Then in ILlustrator placed the open PS file. I get the same result if I use the links palette option or short cut. The duplicate PS file appears with identical name "test.psd". If I alter the duplicate file in PS, it does not affect the first "test.psd". Totally different than opening a second PS file under Window Arrange>New Window>filename, which is the same as opening Window>New Window in Illustrator for editing.