Please check what is the external editor selected under Preferences--External editor?
It says "Edit in Adobe Photoshop CC 2015"
Additional External Editor .....
Sent from my iPad
Many thanks for the help I received. The problem was solved by Adobe chat, excellent service.
can you tell me, what was done by "Adobe Chat"? I've the same problem!
Are you also using Lightroom CC?
Is "Edit in Photoshop" grayed out or clicking on it does not trigger Photoshop ?