Picture disappears and become a green block

I incorporated a pix in my timeline and sent it to Motion to animate.
Because it is a huge file, motion rescaled it.
Once I animated it and go back to FCP, the pix looks fine, until I render it and then it becomes a green block...

Probably a graphics card issue. You should scale down the source image before bringing it into FCP. You can do so in Preview.

It makes sense as I have a recurring issue with a message error saying that the graphic card isn't able to render some effects.
I'll follow your advice
thanks