Build-Analyze leaks

Question

I'm getting crazy with Build-Analyze and leaks, so I'll apreciate any help with these code:

1- First code:

-(void)viewDidLoad {
self.navigationItem.titleView = [[[UIImageView alloc] autorelease] initWithImage:[UIImage imageNamed:@"myImage.png"]];

[self.navigationController.navigationBar setTintColor:[UIColor colorWithRed:1 green:0.529 blue:0 alpha:1.0]];

[super viewDidLoad];
}

In this case the analyzer returns "Object sent - too many times (2)", and I don't know why!!!

2- In this other code the analyzer says "Potential leak of an object allocated on line 88" (line 88 is the first one):

- (void)annotationViewClick {
InfoCategoriaViewController *nextController = [[InfoCategoriaViewController alloc] initWithNibName:@"infoCategoriaView" bundle:nil];

    [self.navigationController pushViewController:nextController animated:YES];

    [nextController verCategoria:par_nombre arg_distancia:par_distancia arg_direccion:par_direccion];
}

In this code I've tried to release the pointer "nextController", but the app crashes if I do that :-(

Thank you.