I switched my project over to new beta versions of iOS 10 and XCode 8. In all three areas of my app where I use:
imageView.layer.cornerRadius = imageView.fra
I had the same problem and calling layoutIfNeeded before all the rounded corner / clipsToBounds stuff fixed the issue. iOS 10 GM with xcode 8 GM causes views to disappear due to roundedCorners & clipsToBounds
layoutIfNeeded
clipsToBounds