Google Blogger has made a few updates in the past months. One of the updates which may have an effect on your blog's appearance is that Blogger images are now stored in Picasa web albums.
If you have your images stored in Picasa albums, you must load the images as "public". If you do not load your photos as public, they will appear as a large black square with a line through it.
Also, if you have signed up for Google +, DO NOT DELETE your Picasa Albums when you view them in Google +. If you do, you will not be able to retrieve your Blog images and will have to re-load every single image, as your blog images are now stored in Picasa.
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Thanks for the heads up. I had notice that Blogger has made changes over the last few months but this I didn't even think about. I noticed that in Google + I had a lot more albums than I had intentionally uploaded. Now I know where the came from.