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It happened on my old PC and it still happens with the new one, with a fresh Ubuntu 12.10 installation (Unity). When returning from a screen lock (I couldn't say if it can be replicated in other ways), some indicators are missing: pidgin, thunderbird (with firetray extension), jdownloader...

I don't know whether those indicators have something wrong regarding unity's tray or something related with global menu is cutting out a certain size of left edge of a long tray, whatever it contains.

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You can first try to update to the new gnome-screensaver with apt. the new Version is 3.6.0. and fixes some broken links with the lock screen!

Here is the Changelog - i think this might help! It has been released four days ago!

gnome-screensaver (3.6.0-0ubuntu2.1) quantal-security; urgency=low

  • SECURITY UPDATE: broken screen locking with Unity desktop (LP: #1120126)
    • debian/patches/19_autostart_in_unity.patch: change AutostartCondition so gnome-screensaver gets started properly in the Unity session also.
    • CVE-2013-1050 -- Marc Deslauriers Sat, 09 Feb 2013 09:44:56 -0500

** Changed in: gnome-screensaver (Ubuntu Quantal) Status: Confirmed => Fix Released

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I'm already running that version. – jasmines Feb 14 '13 at 8:03

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