Theme parsing error: gtk-widgets.css:62:17: Theming engine 'unico' not found

[dino99]

Get many : " Theming engine 'unico' not found " error logged by different packages (gnome and the likes, apport)
Looking at libgtk-3-0 dependencies, there is : "Breaks: gtk3-engines-unico (<1.0.2-0ubuntu2)"
And RR actually have version "1.0.2+r139-0ubuntu2" which seems to confuse libgtk-3-0, and producing that error.
Might need to better rename that package.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: libgtk-3-0 3.6.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.7.0-0.5-generic 3.7.0-rc4
Uname: Linux 3.7.0-0-generic i686
ApportVersion: 2.6.2-0ubuntu3
Architecture: i386
Date: Sun Nov 11 07:28:26 2012
MarkForUpload: True
SourcePackage: gtk+3.0
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Iain Lane (laney)]

Fixed but I forgot to close this bug in the changelog. Thanks for reporting!

[Hanine HAMZIOUI (hanynowsky)]

Hello.
I am still having this bug on 12.10 AMD64.
That affects all the Gnome applications (gnome-something...).

Besides the fact that all or almost gnome apps lost their integration with Ubuntu Global Menu, I get the same error.
Example: in Terminal, run : zenity --progress

This problem occured when I used the GNOME3 PPA to upgrade NAUTILUS . When I purged this latter and re-updated, the issue still presists. AM I missing something? Or the fix was only for RR.