Using 'Preview' can sometimes mangle long urls it seems?
I pasted the same url for all 3 posts, but used 'preview' for the first 2 and my url got trashed.
Ah, I Know This One
Ok, so when you preview, your post is getting output into the html without any escaping. Because your url included & followed by the word "quote", the browser parses that as the html entity for a quote, breaking the post.