Working on this end. Probably have to first install Photoshop then CC, the order is kind of important. Try uninstalling LR, then install again.
It was working from LR CC to PS CC before I upgraded ACR 9.0. Now LR 6 does not EDITIN PS> It does render "Edit in" to my PerfectEffects plug-ins. This sucks because this is my major workflow.
I suspect this is an issue with ACR9 being updated. When you invoke the Edit In command, LR calls on ACR to render. So the two are not talking to each other properly. I didn't have this problem but in the past, the solution was to reinstall Photoshop and then Lightroom.
Part of the problem was on my end. I had moved the original files so there was no original file to edit.
However, there was no indication on the thumbnail that the file was missing either. Unlike in previous versions where there would be an exclamation mark in the upper right corner of the thumbnail frame.
That seems to have been omitted.
Thanks for all the input.