If you’re a self-hosted WordPress user, and you’ve noticed some site images not loading, it may be a result of a failure with the Photon photo caching feature in JetPack.
Try turning off the feature under Dashboard > JetPack > Settings > Appearance.
Delete any SuperCache or other local plugin site cache because those will still point to the JetPack hosted images. Then once the cache is cleared, you can enable these again.
This issue was observed, the above workaround proved to be a short-term fix, at 3:50 PM CST on 23 February 2017.