My iphone 4s won't play music videos?

So recently i've received this iphone 4s as a birthday gift with Verizon as the carrier.
Obviously, I downloaded music videos via itunes and they've downloaded into my phone. Though, when I press the video app, the video appears but it has this white glaze over it. If i press it, nothing happens. I've bought over 10 videos and it'd be a waste. When I sync my phone, it says "Title---Artist - can't be played on this iphone." I've asked many apple "geniuses" but they keep just telling me that I need to update my phone. I have the lastest ios 6.1.1 and I don't use quicktime.

Now you wouldn't have this problem on an android.

There are two reasons why it shows up like that.
1. Not enough memory
2. Didn't finish downloading.
To fix the problem either erase some apps or data or redownload the video.

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