can't modify or even turn off system notifications

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https://www.kubuntuforums.net – Ever since upgrading I've been battling with system notifications. Every time I move or copy a file a notification pops up and I can't seem to turn it off. The settings for 'tray icon' and 'popup' don't seem to have any effect either - since upgrading, I've only ever got the system tray notifications. When I click on the settings icon in the notification, this (completely blank and useless) window pops up: notifications.png I've dug through 'manage notifications' in system settings as well, and can't find where to turn off notifications for moving files etc. What's more, when I empty th (HowTos)