On iOS 6 SDK I wrote the following lines of code to display an image inside a button:
NSURL *thumbURL2 = [NSURL URLWithString:@\"http://example.com/thumbs/2.
I had the same issue. On my storyboard I had a button without any image.
I would then assign the image in the code.
IOS 7 came and I got a lot of blue images.
The resolution was simple yet confusing. If I assign any image on the storyboard and then change the image at run time it works fine.
You always must specify a starting image on the storyboard even if you are not going to use it.