This is a known issue with Vimeo and Safari in iOS 9.3.1. It should be fixed in a future release of iOS. In the meantime, try watching on the Mac or with a different web browser:
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This is a known issue with Vimeo and Safari in iOS 9.3.1. It should be fixed in a future release of iOS. In the meantime, try watching on the Mac or with a different web browser: