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Any video goes with black screen and green box in it .
When I press play , screen goes black and green box is on screen but the audio runs fine.

I ignore it by pressing lock button.

Help!! This is happen with me again in Windows 8.1 Denim phone.

[pankaj981]

Do videos shot with your phone's camera work fine or are these videos downloaded from somewhere else?

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I've been solved it by doing soft reset...

[pankaj981]

Glad it worked!