iPod running 4.2 background image has slight error, when iPhone simulator 4.2 is fine

I have an interesting problem. My app runs fine on the iphone 4.2 simulator, everything works as i expect. However when I put it onto my ipod to test it out it seems to have one slight background image problem.

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The background that i have loaded in using interface builder displays correctly, however, when I try to run this code, the ipod does not display it...

UIImage *img = [UIImage imageNamed:@"v3_default_bg.png"];
UIImageView *bgView = [[UIImageView alloc] initWithFrame:self.view.frame];
bgView.image = img;
[appDelegate.navigationController.view addSubview:bgView];
[appDelegate.navigationController.view sendSubviewToBack:bgView];

Could anyone shed some light on this for me? that would be really great! Thanks.

edit

Actually I have found that the uiimage is returning null on only iOS devices. On the simulator it works just fine. Any ideas?

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You might check the Copy Bundle Resources settings under your target -> Build phases -> last section 'Copy Bundle Resources' is there an entry for the image? If not you need to create one by clicking the '+' button and select your image. Or check the case sensitivity. iPhone simulator does ignore the cases - the device does NOT! Same as in this question cell.imageView is working on Simulator but not on Device.

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Found it. It turns out that on the simulator, image names are not case sensitive. But on devices they are...