I need an advice re Plasma 5.x. My system is Kubuntu 17.04.
I've broke something and now my start menu (org.kde.kicker, imho) do not display favorite apps and regular applications in corresponding tabs. Computer, recent and Exit tabs are fine. The .desktop files are still on HDD. I can kill plasmashell and start it via sudo - in this case the start menu content is displayed properly (but without icons). So the problem must be with file permissions.
I've tried to reinstall several system packets, remove/add kicker plasmoid, session logoff/login - it helped few times but only temporary - the menu content disappears again.
Also the content disappears from Alt+F2 menu (org.kde.kickoff ?) at the same moment.

Any idea where the things got broken?

Try to remove/rename the folder ~/.config/menus/, this contains the user's menu structure.
Or choose "Restore system menu" (or similar) in kmenuedit.

Unfortunately, this doesn't help.

I'm getting

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$ kbuildsycoca5 --noincremental
kbuildsycoca5 running...
"applications.menu"  not found in  ("/home/me/.config/menus", "/etc/xdg/menus")

It seems I have the same problem described here:
https://ubuntuforums.org/showthread.php ... 866&page=2

I've launched

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$ locate applications.menu

and got some candidates to populate it from. Then I did:

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$ cp /etc/xdg/menus/kf5-applications.menu /home/me/.config/menus/applications.menu
$ kbuildsycoca5 --noincremental

and got error

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VFolderMenu::loadDoc: Parse error in  "/home/me/.config/menus/applications-merged/xdg-desktop-menu-dummy.menu" , line  1 , col  1 :  "unexpected end of file"


so I removed it and tried again:

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$ rm /home/me/.config/menus/applications-merged/xdg-desktop-menu-dummy.menu
$ kbuildsycoca5 --noincremental

now it completed fine.
I still can't see Apps in launcher menu but at least they could be found when I start typing in it. It seems I just need to restart plasma session....

P.S. Yes it fixed the problem after plasmashell relaunch.