Odd Gnome problems, or, what happened to my icons?

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While upgrading Windbringer's systemware yesterday, I suddenly ran across a rather odd problem: all of the icons on my Gnome desktop suddenly turned into the default Gnome "blank page with a corner folded down" icon, which meant that Gnome wasn't able to figure out what sort of file a launcher really was. Even more oddly, the names of the launchers themselves turned into (for example), "gtkpod.desktop" rather than "GTKpod", which meant that double-clicking on anything resulted in the contents of the launcher being opened in a text editor. Everything inside of the Gnome application menu could still be executed …

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