This is the case if an image is not loading or timing out. It is the replaced by the ALT text which is what you see. A time out could occur for various reasons... Perhaps a slow internet connection, or something slowing down the link between you and MR. Nothing serious, but next time you can try to refresh your browser to make sure it attempts to load the images again rather than relying on its cache. Once the images are in your cache, you should have no problems anymore (unless you delete your browser cache again).
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