I attempted to setup pfimage view storyboards in the following manner:
I dragged a UIImageView and then changed its class identity to PFImageView.
Then I dragged
"Unknown class PFImageView in Interface Builder file"
Adding the following to applicationDidLaunch in your AppDelegate forces the view class to load so it may be referenced correctly
//In AppDelegate / applicationDidLaunch add:
[PFImageView class];
//Pictures loads perfectly now!!:)