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Description of problem: After having upgraded KDE from 4.10 to 4.11, Oxygen applications theme disappeared. Going into KDE system settings->applications aspect (first icon upper left, I use KDE in Italian), I can see CDE theme as active, and no Oxygen entry in the menu. Version-Release number of selected component (if applicable): KDE 4.11.1
$ rpm -qa oxygen* oxygen-gtk-1.2.0-4.fc19.noarch oxygen-gtk3-1.2.0-1.fc19.x86_64 oxygen-gtk2-1.4.0-1.fc19.x86_64 oxygen-icon-theme-4.11.1-1.fc19.noarch
This sometimes happens when ~/.config/Trolltech.conf gets corrupted [Qt%20Plugin%20Cache%204.8.false] or [Qt%20Factory%20Cache%204.8] group values Try removing or renaming ~/.config/Trolltech.conf to see if that helps.
Yes, removing ~/.config/Trolltech.conf fixed the trouble. What can cause Trolltech.conf corruption?
No idea yet, it's rare enough to not fall on upstream radar.