Have just spend an hour figuring out why Blogger's admin. "quick edit" button disappeared from my blog.
After wading through a mass of complex and totally irrelevant advice from the well-meaning and apparently clueless, I found an explanation of the problem and a simple solution at Deepak Kamat's StramaXon blog, which Kamat describes as "A Blogger and Web design help blog."
StramaXon offers what looks to be most helpful advice on many issues that must sometimes drive programming-illiterate Blogger users crazy. This is a resource worth book-marking.