I've found a bug with 126.96.36.199xx, 188.8.131.5232 and 184.108.40.20606 drivers.
If I enable automatic filter chrominance + luminance denoise, playing flash videos in fullscreen freeze in a still picture.
The video back to work if I press esc, and go back to playing in a window.
AsRock Z77 Chipset (Intel HD4000)
Windows 8 64 bit