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How Can I fix it?
I dont see icons and preview:
http://www.fotosik.pl/zdjecie/pelne/fbbd117a8b4db39e
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What File Manager do you use? It seems that it's build againts of qt4. Maybe you missed install those package like breeze-kde4 or oxygen-kde4. But... Dolphin has been ported to KF5 then it's better to use KF5 version of it.
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