With LR 5.x and earlier, right-clicking on photo gave option to "Edit in Photoshop x.x". After upgrade to LR 6/CC, images will not open in Photoshop 2014 CC.
OS: Windows 8
I have just had this problem, and uninstalled then reinstalled photoshop which seems to have solved it.
It looks like the links between the programs didn't survive the update. Reinstalling photoshop re-established the links.
Thanks. Uninstalling & reinstalling did re-establish the links. Unfortunately, Photoshop CC 2014 is not working well with my Nik plug-ins either, so I have had to downgrade to Photoshop CS 6.