It seems to be the same problem of bug #48716, but note that I don't have problem with colors. The graphic on the button is just "scrambled". If I move the mouse pointer over a "bad button", the picture is repainted correctly.
-- Garbage on buttons using Ubuntu Theme https://launchpad.net/bugs/50316 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs