Using Norton Security with Backup 22.8.0.50 on Windows 10 version 1607 (64 bit).
Today I noticed that all program shortcuts in my start menu were gone. They also could not be found using Windows Search. I looked at the shortcuts folder (C:\ProgramData\Microsoft\Windows\Start Menu\Programs) and noticed that all .ink files were removed on 12:19.
Image 1: http://i65.tinypic.com/280pamq.png
I looked in the Norton history and found that it did an automatic cleanup of Windows temp files on that time. The details showed that Norton did something to those shortcuts.
Image 2: http://i63.tinypic.com/ab6onk.png
For now I restored the shortcuts using Recuva and disabled Nortons cleanup feature. But I think it is a bug and should not be happening.