And a restriction could be the problem but a 512 shortcut restriction seems highly unlikely.

I'm afraid many of the 'applications' (Apps can't be displayed in this menu), are also executables found by Windows that I wouldn't have had in the old startmenu. So the count is much higher than...

This may well be the cause of our issue:
Other thread on this forum explains what we're looking at.
Windows 10 Can't Display More than 512 Apps in the Start Menu - Windows 10 Forums

Other thread on this forum explains what we're looking at.
Windows 10 Can't Display More than 512 Apps in the Start Menu - Windows 10 Forums

To explain: the all users Program data folder has teamviewer:
28547
But the Alphabet-menu 'All Apps' does not:
28548

And a by the way: I checked the permissions too that were reset by the upgrade, but to no avail. Permissions do not seem to be the issue here.

They are not added twice, it's a matter of reading carefully what has been written. They are displayed twice.
And this whole thread is of no use to those who updated because it simply doesn't work...

Same here and looking for the solution. What I've found so far have been tips that refer to a folder with the exact same path as it is since W7/Vista. True: I see some applications in that path, and...