I have the same issue on my GA Z77X-UP5TH since updating to 10.8.5. This issue only affects Chrome and flash playback, this is an issue with Chrome / 10.8.5 / flash, not the hackintosh as there are many people here that have complained of the same issue since the update:
https://productforums.google.com/forum/#!topic/chrome/8dmv8Gjc7P0[1-25-false]
Nothing to do but sit back and wait until Google or Apple fix the issue. I tried switching to Chrome Canary but it make no difference, so switching back to Safari or Firefox for flash vids until the issue is fixed.