iMovie green screen problem

Sometimes the green screen feature works like a charm and sometimes nothing happens. Does anyone else have this problem?

I accomplished my task in a different way. Did not use Green Screen but saved my images as .png files, imported them into iMovie through iPhoto and then used the "cut away' function to key them over video. Works great!

Same problem

I have the same issue with files working fine in one project and when I open a new project and apply the exact same files they fail. My solution is that I end up duplicating the project that worked and then start my new project in that and find it works. I assume its something in my settings for my projects that to date I can't find! It seems to be the only link.