Hi Mark and Dave! I've tried it and it seems to work properly (the "coloured" buttons as http://utenti.lycos.it/aragorn995/UBUIMMA/uno.png have disappeared )!
Many thanks for the fix Enrico -- Cairo and ATI RENDER extension cause scrambled buttons in UbuntuLooks https://launchpad.net/bugs/34435 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs