Lately many of videos from cam4 are very badly distorted. This used to happen from time to time, but it's now happening frequently. They range from freezing and distortion, to 1/6th at the top being clear and the entire rest of the video is green. If you can can please email me, I can send you screen caps so you can see exactly what i'm talking about.
Sorry for the long delay!
Can you go to the Streaming tab in the Preferences and enable "Always Record HTTP" and "Always Record RTMP". Then try capturing from this site. You may still see occasional distortion but it should be much better.
Note that you need to leave the video running in the browser to capture it with these settings on. In general it's best to leave them off for most sites.