I just upgraded my PC from 12.04 to 12.10. Everything goes fine, but after all I get into some troubles with Ambiance theme (screenshot), on right-click menu, or file menu; text have background what makes it unreadable. In 12.04 everything was fine, after updating I do not enable any additional ppa. I also try reinstalling light-themes. Every other themes work normally.
closed as too localized by Anwar Shah, con-f-use, Mik, Jorge Castro, devav2 Oct 25 '12 at 18:39
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maybe installing this will help http://www.webupd8.org/2011/12/light-themes-evolved-ambiance-and.html remark :this doesnt replace default theme its still in list(use gnome tweak tool to chose theme)