WTF: ios6 PresentViewController:animated:completion is offset

SampleVC.m

// The presenting view controller method

- (void)showMyModal {

    NSLog(@"is landscape : %d",UIInterfaceOrientationIsLandscape(self.interfaceOrientation)); // prints 'YES'

    UIViewController* lvc = [[SampleViewController alloc] initWithNibName:nil bundle:nil];
    self.modalNavController  =[[UINavigationController alloc] initWithRootViewController:lvc];
    self.modalNavController.modalPresentationStyle = UIModalPresentationFormSheet;
    self.modalNavController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    //self.modalNavController.wantsFullScreenLayout = YES;
    
    [self presentViewController:self.modalNavController
                       animated:YES
                     completion:^{
                         
                
    }];
     
    [lvc release];
}



//// The SAmple View Controller that does very little
#import <UIKit/UIKit.h>

@interface SampleViewController : UIViewController
@end



#import "SampleViewController.h"

@interface SampleViewController ()

@end

@implementation SampleViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)pop{
   // TTOpenURL(@"tt://pad/tabs");
}

- (void)viewDidLoad
{
    
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    UIColor *randomColor = [UIColor colorWithRed:arc4random()%256/255. green:arc4random()%256/255. blue:arc4random()%256/255. alpha:1.f];
    self.view.backgroundColor = randomColor;    
}

- (void)viewDidUnload
{
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
	return YES;
}

- (BOOL)shouldAutorotate {
    return YES;
}

- (NSUInteger)supportedInterfaceOrientations {
    NSLog(@"%d",UIInterfaceOrientationMaskAll);
    return UIInterfaceOrientationMaskAll;
}

@end