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If you are having an issue with pictures, make sure that they are "small" enough.  Reduce them both directions in Paint, generally to 20% or something like that. Save them to your hard drive, make sure to name them a little different than the originals.  Make sure that once you made your post, to Then attach the pictures to your post, it will not work if you have not posted your post.
I know that is a clear as mud.