Comment 33 for bug 445435

When I strace evolution, and select the email with the tiff attachment, I can see it trying to open this file:

/usr/share/icons/Humanity/mimes/22/image-x-generic.svg (via image-tiff.svg symlink)

If you want to stick with Humanity theme (which I did).. you can copy the png from oxygen theme:

cp /usr/share/icons/oxygen/22x22/mimetypes/image-x-generic.png /usr/share/icons/Humanity/mimes/22/image-x-generic.svg

yes its a png with an svg extension, but it solves the problem!