Black dots in cycles render

Hello! I’m having a strange problem with cycles. It creates lots of black dots as long as it renders the image, as you can see in the video. The dots have very strange values of RGB. What could be the problem?

[video]http://youtu.be/YUB_kpptC4w[/video]

Maybe upload a few screen grabs and explain what the materials are, it’s not so clear in the video :wink:

I found now that it was caused by the bump in a water material! Il try to set it in another way or to remake the material. Thankyou.