Comment 47 for bug 1300722

This is obviously long past the most recent thread activity, but just in case people fall on this page, I had this problem, as well as with evince-thumbnailer.

It turned out to be a permissions problem in my home folder tree. It probably came from some activity I had undertaken while sudoed - my bad, of course.

The solution was simply:

sudo chown -R <my_id>:<my_group_id> /home/<my_id>

Of course, that command may not be fully suitable if you have deliberate ownership differences within your home - adapt as necessary.