The problem is that that toolbar is marked as a primary toolbar, which ambiance colors dark. I've removed that in gedit upstream[1]. I'll backport the patch when it is accepted.
[1] https://bugzilla.gnome.org/show_bug.cgi?id=721813 ** Bug watch added: GNOME Bug Tracker #721813 https://bugzilla.gnome.org/show_bug.cgi?id=721813 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gedit in Ubuntu. https://bugs.launchpad.net/bugs/1260761 Title: file browser toolbar has wrong background color in Ambiance To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gedit/+bug/1260761/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs