When I try and Auto-Analyse my entire Library, it gets stuck on a particular track. Interestingly, this happens on the same track on the iPhone 4S AND iPad 2 version of Djay2. (They both have a copy of the same Music Library.) I have tried restarting the app and restarting the iPad/iPhone.
What happens when you load the song manually? Also, which djay version do you have exactly?