I've seen this happen on my PC too, I was just about to report the same bug. I have seen it on buttons and also scrollbars. The colours seem to be random. Sometime buttons are green, other time black, other times orange. Scrollbar backgrounds have a green rectangle on them.
I use the xorg ati driver and 24bit screen depth with the Ubuntu defualt theme. ** Changed in: Ubuntu Status: Unconfirmed => Confirmed -- buttons color display error https://launchpad.net/bugs/57845 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs