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(Apologies if I filed it under wrong component. Reassign as necessary). I Just installed XFCE on my F15, which had only Gnome desktop installed before that. A lot of icons are missing. Such as: I drag Terminal icon to the top panel in order to create a launcher for terminal, and resulting button has no icon at all; I launch evolution from command line and it complains (emits messages to stderr) about missing icons. Stuff mostly still works, but shows "iconless", empty buttons in many places. Some buttons do show icons. Going to Setting->Setting manager->Appearance->Icons and selecting "GNOME" instead of "Fedora" fixes this. I guess it needs to be made non-broken when one uses "Fedora" choice there too, especially considering that it's the default.
I have similar problem in Fedora 17 (Beta RC1), except of there's no default "Fedora" icon set. You have to go into Appearance settings and select some icon set though. Otherwise most of the icons is not displayed. The rest of the steps are the same as reporter's. Installed Fedora with GNOME and then installed xfce using yum groupinstall XFCE.
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