I have been able to reproduce systematically some of the bugs above- mentionned.
Using the default "Ubuntu" theme, I have systematically the bugs in the dialogue box for setting the background and also for the preferred applications. See the respective screenshots attached. These bugs don't persist for all theme but for sure for the default theme and also for the "outdoors" theme, that I have tested so far. Now that the screenshots are online in the french forum it seems that more users experienced this kind of trouble. -- Wrong color in fields of Gtk apps with some themes https://launchpad.net/bugs/57417 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs