We figured out that this was actually a bug in the gnome-desktop3 package provided in the GNOME3 PPA. I uploaded a new version with the fix. Thanks Tim & Britt for figuring this out!
** Changed in: gnome-desktop3 (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-desktop3 in Ubuntu. https://bugs.launchpad.net/bugs/1131104 Title: AM/PM time no longer working in Gnome Shellin Raring To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1131104/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs