Comment # 3 on bug 953954 from Wolfgang Bauer

(In reply to Jaroslav Kamen�k from comment #2)
> Maybe.. I see all system icons well, icon from old opera 12.16 is there too,
> pidgin and skype are not. Installed at three PCs and it is same.

Well, does the workaround help?
I.e. do the icons appear when you toggle categories > miscellaneous in System
Tray Settings?

PS: for skype you should install sni-qt-32bit, although Plasma5 should also
show old-style icons meanwhile.