What does Pin To Start actually do?

Well, I'm outta ideas. It's not working at all anymore. Dragging the right side icons around works nicely. Pin to Taskbar works nicely. Ping to Start does not, neither right clicking on an All apps item, or right clicking on an exe file.

The pinned item list never updates unless I restart Explorer. There must be some sort of signalling that isn't working. The list of pinned programs is clearly getting updated because restarting Explorer works, but somehow the Start menu isn't being told to update what's on the screen.

I know nothing about how pinning works under the covers so I guess I'm at a dead end. Can't think of anything else but a clean install but that isn't in the cards for the present.

Thought of one more thing to try. I logged out and logged in as Adminstrator (it's enabled). That doesn't work either so whatever it is it isn't limited to my account only.

That's a shame. Since I was running Kasperski 2015 that sounded worth trying. I uninstalled, rebooted, installed 2016, rebooted.

No go. The start menu still refuses to update itself when I pin/unpin programs. Thanks anyway.

I have the same problem, I have Kaspersky Internet Security 2016 (latest build) . I just hope this bug will be fixed when Microsoft releases early August fix.

I just installed the Cumulative Update for Windows 10: August 5, 2015 and it did NOT fix it. I saw Pin work once and now Pin/Unpin are dead again.

I found out it is a bug related to kaspersky internet security not windows! visit this page in Kaspersky support forum in which Kaspersky itself has confirmed the bug:
Kaspersky Lab Forum t pin-unpin with Kaspersky

Thank you very much for posting that. I will follow along in the Kaspersky forum until they issue a fix for Pin/Unpin not working.