All of sudden, after I have opened an image in the current version of Photoshop CC (2015.1.1), when I try to open another image in this same program, it opens the image in a duplicate version of the program in another window. This only happens when I select an image file and use "open with...", not when I open files out of Lightroom CC.
Another issue I see is that, when I select a file and use "open with", I see choices for earlier versions of Photoshop CC 2015. Why aren't these choices going away when I do the incremental updates to the program? I do not see these previous versions as choices in my applications folder.
I am on a Mac with El Capitan, to which I updated in the past few weeks. I don't recall this problem before updating the OS, and I can't recall trying to open multiple images into Photoshop, except with LR, since updating the OS.