UIScrollView not responding after returning from FlipsideViewController

I have written a simple example where I have a Utility app project with one UIScrollView

on it. When I press the info button to flip the screen and the return is UIScrollView

now unresponsive. Not only that, but I deliberately placed the scroller in the Builder interface in the upper left corner and then programmatically set it in the center. when i come back from flip it moved to the top left corner and didn't react. why?

This is my file .h

:

  #import "POCFlipsideViewController.h"

    @interface POCMainViewController : UIViewController <POCFlipsideViewControllerDelegate, UIScrollViewDelegate>

    @property (nonatomic,retain) IBOutlet UIScrollView *scroller;
    @end

      

        
        
        
      

    

This is my .m file

#import "POCMainViewController.h"

@interface POCMainViewController ()

@end

@implementation POCMainViewController


@synthesize scroller =_scroller;

- (void)viewDidAppear:(BOOL)animated
{

     [_scroller setContentSize:CGSizeMake(80.0f, 320.0f)];
     [_scroller setFrame:CGRectMake(120, 131, 80, 214)];

    [super viewDidAppear:animated];
}

- (void)viewDidLoad
{
    _scroller.delegate = self;
    _scroller.showsVerticalScrollIndicator = NO;
    _scroller.decelerationRate = UIScrollViewDecelerationRateFast;

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Flipside View

- (void)flipsideViewControllerDidFinish:(POCFlipsideViewController *)controller
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showAlternate"]) {
        [[segue destinationViewController] setDelegate:self];
    }
}

@end

      

        
        
        
      

    

The rest is the boiler plate straight from Xcode.