I see exactly the same symptoms with a clean CD install (not dist upgrade) on a Compaq nx9010. Outdoors and the new Ubuntu Human theme buttons have dotted lines in them. All other themes are fine.
-- Two themes screw up GNOME buttons from fresh install. https://launchpad.net/bugs/51279 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs