All text in the Gnome toolbar, Panel, workspace switcher, etc. has subpixel rendering applied as appropriate for a BGR screen, even though my monitor has subpixels in the far more common RGB order. This results in white-on-black text having distracting red fringing on the left and blue on the right. No apps are affected (including the Settings dialog).
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: gnome-shell 3.23.90-0ubuntu3
ProcVersionSignature: Ubuntu 4.10.0-9.11-generic 4.10.0
Uname: Linux 4.10.0-9-generic x86_64
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
Date: Wed Mar 8 12:30:33 2017
DisplayManager: gdm3
InstallationDate: Installed on 2016-12-02 (95 days ago)
InstallationMedia: Ubuntu-GNOME 16.10 "Yakkety Yak" - Release amd64 (20161012.1)
ProcEnviron:
LANGUAGE=en_AU:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_AU.UTF-8
SHELL=/bin/bash
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)
Thank you for taking the time to report this bug and help make Ubuntu better.
Hopefully, this bug will be fixed in mutter 3.23.92 expected by the end of next week.