dyldCache is broken and I don't have a JB device. The rest solution are based experience of dealing with similar situations.
if CKTranscriptCollectionViewController is CKBalloonTextView's viewController.
There should be a method setting up CKBalloonTextView in CKTranscriptCollectionViewController.
From there you can iterate all the CKBalloonTextView ,since they are now initialized, you shouldn't have trouble now.
Also.
Use
NSLog(@"%@",arg1);
%orig;
cuz sometimes %orig will release the argument and thus you can't get any value
EDIT: Forwarded this issue to my fellows, they might help you better cuz i don't have JB device for testing now