Kscreenlocker plugins don't work?

[mikb]

Whenever kscreenlocker becomes active, the screen is locked, but the background plugins don't work - I just get a plain black background. It doesn't matter what plugin I configure in systemsettings, the result is the same. I can't find any error messages being generated anywhere. It's not fatal, but it is ugly. Desktop wallpaper is working.
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With sufficient thrust, pigs fly just fine (RFC 1925, apparently talking about Gentoo)