Looking at xenial by comparison, it appears not that the disabled colour has changed, but that the disabled buttons are now placed on a lighter background.
In xenial they're below the titlebar, where the grey background is darker. In artful they're in the titlebar where the grey is lighter. So the increased contrast now looks odd. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ubuntu-themes in Ubuntu. https://bugs.launchpad.net/bugs/1698050 Title: Disabled arrow buttons in Nautilus header bar are too dark Status in ubuntu-themes package in Ubuntu: New Bug description: Disabled arrow buttons in Nautilus header bar are too dark, under Gnome Shell. They don't look disabled as much as they look like a rendering bug, or look like depressed buttons. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: light-themes 16.10+17.10.20170518-0ubuntu1 ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15 Uname: Linux 4.10.0-22-generic x86_64 ApportVersion: 2.20.5-0ubuntu4 Architecture: amd64 Date: Thu Jun 15 11:41:54 2017 InstallationDate: Installed on 2017-05-03 (42 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170502) PackageArchitecture: all SourcePackage: ubuntu-themes UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-themes/+bug/1698050/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp