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this looks like either a codec issue , GPU issue or corrupted preferences.
1. make sure your GPU driver is up to date
2. see if hardware acceleration turned Off makes a different (under preferences->display)
3. where is this footage from? does it require a certain codec that you did not install?
this is similar issue to this thread: Re: Why does the main window splits in two parts? but unfortunately OP never came back to fill us in
Oo thanks , everythig works normally that i was trought
PS: I have Summer camp 2016 photo
Great! what fixed the problem?
Yes, please let us know how you solved your problem.