AJAX Crawlable Applications not working with pretty URL

AJAX Crawlable Applications not working with pretty URL

I am using google webmaster tool to "Fetch as Google" to find out what
html google get when google crawl to my website. but it show me failed
when i use this PRETTY URL
http://www.lyricsdevine.com/46/Songs_by_Singer/imran-khan#!key=value
and works fine and return exact HTML that i want to show when i use UGLY
URL Like this
http://www.lyricsdevine.com/46/Songs_by_Singer/imran-khan?_escaped_fragment_=key=value
but if i understand right this Google Help Doc then it should work for
PRETTY URL also. does any body know what i am doing wrong. and why google
webmaster tool's fetch status is failed for my PRETTY URL.