Drop shadow not showing up

[christopherdbull]

I've got a custom PrettyKitTableViewCell subclass which I'm trying to get a dropshadow on (grouped table view) and when i set the dropsShadow property to YES in cellForRowAtIndexPath no shadow is created. I'm still relatively new to iOS, so i'm just wondering if anyone can suggest some things I should check that I may have missed?

This is an iOS 5 - 6 app btw, using the latest version for download from this repo.

Thanks