Nautilus randomly fails to show thumbnails of gif files

[Teo]

I have a folder full of gif files.
Of most of them, the thumbnail is shown.
But for a few of them, randomly, only a generic "GIF" thumbnail is shown instead.

Refreshing the directory doesn't fix the issue.

The files are just fine: I can open them in the default image viewer and see the images.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: nautilus 1:3.6.3-0ubuntu16
ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
Uname: Linux 3.8.0-31-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8.4
Architecture: i386
Date: Tue Oct 8 14:22:16 2013
GsettingsChanges:
 b'org.gnome.nautilus.window-state' b'geometry' b"'1322x738+67+85'"
 b'org.gnome.nautilus.window-state' b'sidebar-width' b'180'
InstallationDate: Installed on 2010-06-23 (1203 days ago)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: Upgraded to raring on 2013-08-10 (59 days ago)

[Teo (teo1978)]

Then I pick a file whose thumbnail is not shown, I copy it into another folder, and _there_ the thumbnail is shown.

So it's completely random, it's not something wrong with the file.

I guess something fails randomly when generating the preview.
There doesn't seem to be a way of forcing the rebuilding of thumbnails, by the way

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.

[Launchpad Janitor (janitor)]

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