He superado y eliminado todas las restricciones de los usuarios, pero aún aparece el siguiente errorSOLAMENTE despues de girar el dispositivo. Aunque no tengo ni idea de por qué. ¿Alguien tiene alguna idea?

2013-01-14 21:30:31.363 myApp[35869:c07] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSAutoresizingMaskLayoutConstraint:0x84543d0 h=--& v=--& V:[UIView:0xa330270(768)]>",
    "<NSLayoutConstraint:0xa338350 V:[UIView:0xa331260]-(-1)-|   (Names: '|':UIView:0xa330270 )>",
    "<NSLayoutConstraint:0xa338390 V:|-(841)-[UIView:0xa331260]   (Names: '|':UIView:0xa330270 )>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0xa338350 V:[UIView:0xa331260]-(-1)-|   (Names: '|':UIView:0xa330270 )>

Break on objc_exception_throw to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.