The icon theme is "eXperience", changing it back to the standard GNOME theme does make the error go away. I've attatched the SVG file which I think the shortcut is using (which seems to cause the same error with Nautilus as the .desktop file). I'm afraid I'm not quite sure how to get the other information they want - I'll have a go if they can explain a bit further. Hope this all helps, and thanks again.
** Attachment added: "Gnome-Screenshot icon from eXperience theme" http://librarian.launchpad.net/6722918/gnome-screenshot.svg -- gnome-panel crashes in _cairo_pen_find_active_cw_vertex_index() when opening menu https://launchpad.net/bugs/88605 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs