tooltips are missing (or text and background are same color) in gnome-shell

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http://askubuntu.com – my tooltips are completely black boxes. I can't tell if they are displaying incorrectly, or if it is just that the text and background are both black. I'm using gnome-shell in Ubuntu 11.10, so the settings manager doesn't have the option to change the colors in the tooltips, just background and theme settings. Any idea of what I should do? (HowTos)