This happens only when I mix camera/zoom with any amount of increase in gamma or brightness.. Using Windows 7.
It is NOT an issue when the movie is burned to a DVD.
Here is a sample with the resulting distortion - Look closely around the perimeter. https://drive.google.com/file/d/0BwoDV3WR5dS6T2xKOG56SWI5cGs/view?usp=sharing
I also have MEP 2013, it exports without issues...
Thanks, Phil