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#11
It's a long shot, but nothing else worked:
How to use albums in the Photos app
Again, try a different program if the Keyboard Shortcuts are not working. Also it can be another tile or app that could be keeping you from using the Left & Right Arrows, even if you have clicked on Photoviewer to bring it forward.
There are way better free options like Gimp and others that work better than the freebie that Microsoft put on their OS. Also none of this has to do with Security Permissions, inheritance of rights, etc. It is nothing more than the program not working like it should.
FYI - I just got the Windows 10 Anniversary update and the problem is fixed.