Originally Posted by GregS
Even "EpubGuide-hxa7241.epub" has the wrong mime type and missing attributes in the toc.ncx file.
That caught my attention, so I checked it...
There really doesn't seem anything wrong with my epub (it has the correct mimetype and conforms to the ncx DTD) -- so it seems my epub has found errors in the checker rather than the other way around.
(Thanks for the 'even'.)