Plasma doesn't want to use my mouse cursor theme

[Nikos Chantziaras]

I've updated to KDE 5 two days ago. I have the problem that the mouse 
theme I've set in System Settings is not followed by the Plasma desktop. 
It uses the default, black cursor from X11. When I hover the mouse over 
the task manager, or over a menu or window (except the decoration), then 
the mouse cursor switches to the correct mouse theme. But over the 
desktop or over the decoration of windows (titlebar and borders): nope. 
It switches back to the default, black X11 cursors.

What can I do to fix this?

I'm not sure which version of KDE I have. It seems to be some mishmash 
of versions. 4.14.10, 4.11.21 and 5.3.2.

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