Attached is a pdf file showing the screen shots of my problem. Issue is "edit in PS CC 2015" does open PS CC 2015 but the photo does not load. Eventually an error message in LR appears and you say ok and then LR tries to re-open the already opened PS which if you say yes to the open screen the photo then opens in PS. Check pdf.
It seems like you have UAC enabled for Photoshop by default.
Right click on Photoshop shortcut icon and choose Properties > Compatibility > uncheck "Run this program as an administrator" > click on OK > Relaunch Lightroom and Photoshop and then, check.
This worked so thank you for the correct solution. Could not find anywhere to select "correct" per instructions. Odd but the icon on my task bar still shows admin shield but it is not "admin" approved per the properties of the icon. Thanks for the solution and LR opens in PS correctly!
Glad to know you got it working.