Re: gedit crashes when opening any file
Are you 100% sure there's no ~/.gconf/apps/gedit-2 directory? It should exist.
One more place to look for rogue files is ~/.local/share/applications. You might find some files named gedit-#.desktop. They should be harmless, but that's all I can think of for an issue only affecting 1 user.
Another very unlikely culprit is ~/.config/gnome-panel/launchers, which might have another gedit.desktop, if you have a panel launcher for gedit. Again, I don't think this should pose a problem, but it's somewhat possible.
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The cure to dependency hell: apt-get install apt-file - apt-file search file-from-error