Video thumbnails in image directories break gthumb's GthGridView with message "Gtk-WARNING **: drawing failure for widget `GthGridView': file not found". Following image thumbnails on the current page are not displayed. See https://bugzilla.gnome.org/show_bug.cgi?id=666303 and http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=674112. I attached a patch (preliminary) fixing the problem in the gnome bugzilla entry. Reproducible: Always
looks fixed in 3.2.3