Why won't my iphone 4S will not allow me to watch Yahoo videos?

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My iphone 4S will not alllow me to watch Yahoo online videos. I think it might be related to Quicktime but I am not sure. I've checked with another older iphone user and they are able to see it. Any help please!
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Replay

Pressing the Home button twice does not show you what apps are running. It shows you what apps were recently used.
Download a free app from the App Store. Once it downloads, your other apps should work properly again.