[gnome] Howto reset color profile

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http://ubuntuforums.org – How can I reset my color profile for GTK or Gnome apps? In particular the problem is: I installed the same theme on two machines, where in one case I get white font on a dark gray unity panel, which is fine to read, but on the other machine this font is black and therefore unreadable. I remember that I played with these settings with the old Gtk Theme Manger, which is now changed as of Ubuntu 12.04 (?). I wonder if there is a way to reset this to factory defaults. I'm running Oneiric with the stock version of unity, in case that matters. (Hardware)