Green blocks appears after rendering Motion file in FCP timeline

Once I render my motion file in FCP timeline, I have a green window showing up: two solid green blocks, one on the left darker green filling 1/4 of the canvas, the remaining is lighter green.
I know I am not the only one. When I google results came up but no one found a solution....

Maybe here..

Thanks

I had the same problem with my old G5. After years of use it started doing it. I had also install Looks, but couldn't use it at all, so when I called Red Giant the asked about the video card. They suggested to used one monitor instead of the 2 that I was used to using. That worked for Looks and the green blocks on Motion projects.
Do you have an old video card in you Mac?

God Bless,

Douglas Villalba
director/cinematographer/editor
Miami, Florida

[www.DouglasVillalba.info]
[www.youtube.com]
[vimeo.com]

It could be a possibility actually since I already had issues with error messages pointing in the direction of a faulted card.....