I noticed this as well when changing our project's deployment target from iOS 8.0 to 9.0.
The image asset has
Slices: Horizontal and Vertical
Before changing the deployment target, I only needed to specify the image like so:
imageView.image = [UIImage imageNamed:@"Lines"];
To get the same result under iOS 9, I have to do this:
imageView.image = [[UIImage imageNamed:@"Lines"] resizableImageWithCapInsets:UIEdgeInsetsZero resizingMode:UIImageResizingModeTile];
That is fine for code, but the problem is with using the image in the Launch Storyboard.
I have seen something a bit like that but only with vertical tiling (it shows up fine in IB but not in Simulator). I have horizontal-only tiled images and they work just fine. I just added a vertical-only one but it smears.
Did you ever figure this out? Apparently it's still and issue