Most of you already know this by now, but I am posting this, just incase, some of you are still struggling with JSON in iOS6+.
In iOS6 and later, we have the NSJSONSerialization Class that is fast and has no dependency on including "outside" libraries.
NSDictionary *result = [NSJSONSerialization JSONObjectWithData:[resultStr dataUsingEncoding:NSUTF8StringEncoding] options:0 error:nil];
This is the way iOS6 and later can now parse JSON efficiently.The use of SBJson is also pre-ARC implementation and brings with it those issues too if you are working in an ARC environment.
I hope this helps!