Video on Youtube does not pass on the entire screen

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32.0.1948.69 Stable, Windows 10 Home Insider Preview 10547. In other versions windows same bad.
Adobe Flash Player 19.0.0.185
On version 31.0.1889.174 all ok

Intel i5 2500K
ASRock Z68 Extreme3 Gen3 (bios 2.31А)
Gigabyte GeForce GTX 660 2GB GDDR5 (GV-N660OC-2GD)
Kingston 2x2 ValueRAM KVR1333D3N9/2G
Hitachi 1TB
Smart Buy Ignition2 60GB v8.1
Chieftec A-80 CTG-750C 750W

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Watch video problem https://yadi.sk/i/yUhOffrNjP77X