“Content” is “Web Features” in the latest version. In addition to the above, make sure the subcategory, “for the originating website only” is unchecked. If those sites store their images at a separate URL, having this checked will stop them from loading. The feature is meant to stop third-party ad banners, but it can sometimes catch legitimate offsite images.
I had a problem similar to this once. In an effort to get rid of some blinking adds I had blocked stuff from some akamai machines. A lot of big site like cnn spread there load by putting some common graphics on akamai machines spread about the world.