Renaming variables/classes seems to be broken for me. XCode 4.5.2 brings up a menu asking me what I'd like to rename the variable to, I enter a name and hit preview, and then another screen shows up which brings up the message "The selection is not a type that can be renamed.".
I've tried deleting derived data (via command line, and also via the organizer), it didn't fix it. Anyone found a solution yet? There's been a couple people who've ran into this on older versions of XCode, but they said it was fixed on newer versions (yet I'm using the latest version).