I have a problem with missing icons - I first noticed they disappeared after one of the recent upgrades to Loki.
I have Calendar, Camera, KsystemLog, Screenshot, Videos, Photos and Mail icons missing in Applications. There is a growing sense this list varies but I can't be sure...
They are all fine in plank (though Mail and Calendar seem to share the same icon)
There are also icons missing in System Settings:
Applications, Device Colour Profile, Power, Sound, Online Accounts, Date & time, Parental Control
The missing icons appear as a grey box with bottom left turn up.
I have tried "restore default settings" as suggested in a similar question with no difference.
What can I do to resolve this?