As of the most recent update, Plasma Workspace menus no longer pop up the expected menu. Instead, an error message pops up with the following content:

<pre>
Error loading QML file: file:///usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/Kickoff.qml:31:1: plugin cannot be loaded for module "org.kde.plasma.private.kicker":
Cannot load library /usr/lib/qt/qml/org/kde/plasma/private/kicker/libkickerplugin.so: (/usr/lib/qt/qml/org/kde/plasma/private/kicker/libkickerplugin.so:
undefined symbol: _ZN9KFileItemC1ERK4QUrlNS_21MimeTypeDeterminationE)
</pre>

A similar message is shown for any other application-menu I attempt to use - the Dashboard, Launcher and Menu options.

I have attempted removing and re-installing KDE Plasma and its dependencies, which has not fixed the issue.

Arch upstream does not appear to have this bug.