On one of my projects the project property is widescreen (16:9) and the preference is set for a full screen play back size of "actual size". However the movie plays back at whole screen 4:3 regardless of the actual settings. I have the same settings on another project and they work perfectly OK but on this particular project they don't. Does any one have any ideas?

OS X 10.5.8
iMovie 8.0.4
2.93 Intel Core 2 Duo
4 GB 1067 MHz DDR3