Seems to be fixed now.
** Changed in: nautilus (Ubuntu)
Status: New = Fix Released
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[gutsy] nautilus fails to create previews
https://bugs.launchpad.net/bugs/139968
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is a bug contact for nautilus
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/9295703/Dependencies.txt
** Attachment added: ProcMaps.txt
http://launchpadlibrarian.net/9295704/ProcMaps.txt
** Attachment added: ProcStatus.txt
http://launchpadlibrarian.net/9295705/ProcStatus.txt
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[gutsy]