Internet Explorer 9 causing issues with YouTube... ?

So I recently downloaded and began to use Internet Explorer 9, I was using IE 8 prior to this. And, when I watch YouTube videos now, every single video I watch becomes out of sync with the audio. IE 9 may not be what's causing this but I believe it it, as it was working perfectly fine prior to me using IE 9. Someone please help. I'm frequently on YouTube and it is pretty annoying.