Same issues here. If I remembered well, this appears after these packages updated: Commit Log for Sat Aug 6 12:36:08 2011 Upgraded the following packages: app-install-data (0.11.10.1) to 0.11.10.2 bamfdaemon (0.2.92-0ubuntu1) to 0.2.94-0ubuntu1 binutils (2.21.52.20110707-1ubuntu1) to 2.21.53.20110805-1ubuntu1 binutils-dev (2.21.52.20110707-1ubuntu1) to 2.21.53.20110805-1ubuntu1 cups (1.4.7-1ubuntu5) to 1.4.8-2 cups-bsd (1.4.7-1ubuntu5) to 1.4.8-2 cups-client (1.4.7-1ubuntu5) to 1.4.8-2 cups-common (1.4.7-1ubuntu5) to 1.4.8-2 cups-ppdc (1.4.7-1ubuntu5) to 1.4.8-2 empathy (3.1.4-1ubuntu2) to 3.1.4-1ubuntu3 empathy-common (3.1.4-1ubuntu2) to 3.1.4-1ubuntu3 evolution (3.1.4-0ubuntu1) to 3.1.4-0ubuntu2 evolution-common (3.1.4-0ubuntu1) to 3.1.4-0ubuntu2 evolution-data-server (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 evolution-data-server-common (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 evolution-plugins (3.1.4-0ubuntu1) to 3.1.4-0ubuntu2 firefox (6.0~b3+build2+nobinonly-0ubuntu1) to 6.0~b4+build1+nobinonly-0ubuntu1 firefox-gnome-support (6.0~b3+build2+nobinonly-0ubuntu1) to 6.0~b4+build1+nobinonly-0ubuntu1 firefox-locale-en (6.0~b3+build2+nobinonly-0ubuntu1) to 6.0~b4+build1+nobinonly-0ubuntu1 firefox-locale-ja (6.0~b3+build2+nobinonly-0ubuntu1) to 6.0~b4+build1+nobinonly-0ubuntu1 ghostscript (9.04~dfsg~20110801-0ubuntu1) to 9.04~dfsg-0ubuntu1 ghostscript-cups (9.04~dfsg~20110801-0ubuntu1) to 9.04~dfsg-0ubuntu1 ghostscript-x (9.04~dfsg~20110801-0ubuntu1) to 9.04~dfsg-0ubuntu1 gir1.2-gtk-3.0 (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 gir1.2-polkit-1.0 (0.101-4) to 0.102-1 gnome-session (3.1.3-0ubuntu6) to 3.1.3-0ubuntu7 gnome-session-bin (3.1.3-0ubuntu6) to 3.1.3-0ubuntu7 gnome-session-common (3.1.3-0ubuntu6) to 3.1.3-0ubuntu7 gnome-session-fallback (3.1.3-0ubuntu6) to 3.1.3-0ubuntu7 gtk-3-examples (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 indicator-messages (0.4.92-0ubuntu3) to 0.4.92-0ubuntu4 indicator-messages-gtk2 (0.4.92-0ubuntu3) to 0.4.92-0ubuntu4 indicator-status-provider-mc5 (0.4.92-0ubuntu3) to 0.4.92-0ubuntu4 libass4 (0.9.12-1) to 0.9.13-1 libbamf0 (0.2.92-0ubuntu1) to 0.2.94-0ubuntu1 libbamf3-0 (0.2.92-0ubuntu1) to 0.2.94-0ubuntu1 libcamel-1.2-28 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libcups2 (1.4.7-1ubuntu5) to 1.4.8-2 libcupscgi1 (1.4.7-1ubuntu5) to 1.4.8-2 libcupsdriver1 (1.4.7-1ubuntu5) to 1.4.8-2 libcupsimage2 (1.4.7-1ubuntu5) to 1.4.8-2 libcupsmime1 (1.4.7-1ubuntu5) to 1.4.8-2 libcupsppdc1 (1.4.7-1ubuntu5) to 1.4.8-2 libebackend-1.2-1 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libebook1.2-11 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libecal1.2-9 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libecal1.2-dev (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libedata-book-1.2-10 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libedata-cal-1.2-12 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libedataserver1.2-14 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libedataserver1.2-dev (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libedataserverui-3.0-1 (3.1.4-0ubuntu4) to 3.1.4-0ubuntu5 libevolution (3.1.4-0ubuntu1) to 3.1.4-0ubuntu2 libgail-3-0 (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 libgail-3-common (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 libglew1.5 (1.5.7.is.1.5.2-1ubuntu3) to 1.5.7.is.1.5.2-1ubuntu4 libglew1.5-dev (1.5.7.is.1.5.2-1ubuntu3) to 1.5.7.is.1.5.2-1ubuntu4 libglewmx1.5 (1.5.7.is.1.5.2-1ubuntu3) to 1.5.7.is.1.5.2-1ubuntu4 libglewmx1.5-dev (1.5.7.is.1.5.2-1ubuntu3) to 1.5.7.is.1.5.2-1ubuntu4 libgs9 (9.04~dfsg~20110801-0ubuntu1) to 9.04~dfsg-0ubuntu1 libgs9-common (9.04~dfsg~20110801-0ubuntu1) to 9.04~dfsg-0ubuntu1 libgtk-3-0 (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 libgtk-3-bin (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 libgtk-3-common (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 libgtk-3-dev (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 libgtk-3-doc (3.1.10-0ubuntu1) to 3.1.10-0ubuntu2 libindicator-messages-status-provider1 (0.4.92-0ubuntu3) to 0.4.92-0ubuntu4 libmodplug1 (1:0.8.8.2-3) to 1:0.8.8.2-3ubuntu1 libmono-addins-gui0.2-cil (0.6.1-1ubuntu1) to 0.6.1-2ubuntu1 libmono-addins0.2-cil (0.6.1-1ubuntu1) to 0.6.1-2ubuntu1 libpolkit-agent-1-0 (0.101-4) to 0.102-1 libpolkit-agent-1-dev (0.101-4) to 0.102-1 libpolkit-backend-1-0 (0.101-4) to 0.102-1 libpolkit-gobject-1-0 (0.101-4) to 0.102-1 libpolkit-gobject-1-dev (0.101-4) to 0.102-1 libunity-core-4.0-4 (4.6.0-0ubuntu1) to 4.6.0-0ubuntu2 libunity-core-4.0-dev (4.6.0-0ubuntu1) to 4.6.0-0ubuntu2 libvlc5 (1.1.11-2) to 1.1.11-2build1 libvlccore4 (1.1.11-2) to 1.1.11-2build1 marlin (0.1-0~464~oneiric1) to 0.1-0~466~oneiric1 policykit-1 (0.101-4) to 0.102-1 ubuntu-minimal (1.235) to 1.236 ubuntu-standard (1.235) to 1.236 unity (4.6.0-0ubuntu1) to 4.6.0-0ubuntu2 unity-common (4.6.0-0ubuntu1) to 4.6.0-0ubuntu2 unity-services (4.6.0-0ubuntu1) to 4.6.0-0ubuntu2 update-manager (1:0.152.9) to 1:0.152.10 update-manager-core (1:0.152.9) to 1:0.152.10 vlc (1.1.11-2) to 1.1.11-2build1 vlc-data (1.1.11-2) to 1.1.11-2build1 vlc-nox (1.1.11-2) to 1.1.11-2build1 vlc-plugin-notify (1.1.11-2) to 1.1.11-2build1 vlc-plugin-pulse (1.1.11-2) to 1.1.11-2build1 Installed the following packages: libmatroska4 (1.2.0-1) libx264-116 (2:0.116.2037+gitf8ebd4a-1ubuntu1)