Video Playback Problem

Hello everybody.
First sorry 4 my bad english.
I have a Problem on my xperia u
When i play a video i only see a little stripe of the video on the right side of my screen not the full video.
This problem seems to be not on all videos and the problem came up after i installed galery 3d.
Deinstalled it but problem is still there,is this a codec problem?
Tryed to make a Screenshot but on the Screenshot you see the full video picture not the bugged sreen picture.
Hope somebody understand what i mean-_-

Thanks ;)

Sent from my Xperia U using xda premium