I’ve been using this tool for years in Feed WordPress set ups. A common mistake, and it happened to 2 students this time around, is when I ask for the link to their blog, I get one that is actually the link to their dashboard view of their own blog, like
It’s a subtle thing, but this is not the public URL of a blog. It works for them because they are logged into their own blogs. Anyhow, I added a few more checks on the Magic Box code to trap these errors (you can see a public version at http://lab.cogdogblog.com/magicbox/).