Seems to be a problem with gnome-settings-daemon's clipboard plugin. I can reliably reproduce the theme issue by opening Opera, putting some text in the clipboard using Ctrl+c, and then closing Opera. However, this is _not_ limited to Opera, it's just reliably reproducible with it here.
Backtrace attached (note, that I didn't run this with GDK_SYNCHRONIZED=1 as this would cause the bug to not show). ** Attachment added: "g-s-d_gdb_bt.log" https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/859723/+attachment/2567648/+files/g-s-d_gdb_bt.log -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nautilus in Ubuntu. https://bugs.launchpad.net/bugs/859723 Title: Nautilus appearance without colour or theme Status in “nautilus” package in Ubuntu: Incomplete Bug description: I started Nautilus. Browsing through files and folders appears to be working. However, the appearance, i.e. buttons and layouts has virtually no colours. I uploaded a screen shot of nautilus in order to illustrate the bug. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: nautilus 1:3.1.92-0ubuntu3 ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4 Uname: Linux 3.0.0-11-generic i686 ApportVersion: 1.23-0ubuntu1 Architecture: i386 Date: Mon Sep 26 17:22:15 2011 ExecutablePath: /usr/bin/nautilus ProcEnviron: PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: nautilus UpgradeStatus: Upgraded to oneiric on 2011-09-25 (1 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nautilus/+bug/859723/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp