[Andrew Backinsell]

[Andy Elrick] “Now I have tried to start over and when I open the log and capture tool the preview screen flashes all of these crazy colors like red and blue. I can see the video sometimes in the background but this did not happen before.”

Try this thread for the above situation: https://discussions.info.apple.com/thread.jspa?threadID=2698261&start=0&tstart=0

I had the same and updated the graphics driver, all sorted.