The files are uploading successfully, they just might not be being replicated to the data center that your blog is being viewed from. Replication got behind as we bring another data center online. Sorry about that.
Is this now resolved? I have been trying to upload images into a particular blog post for a week and a half. I’ve upgraded Flash, cleared Firefox Cache, re-uploaded images, created completely new blog post, etc etc. Nothing seems to work. The images appear in post when I write it, but not in the preview or the published version.