I have no Mac here but I'll check when I get back to the house.
i have a imovie 09.
my small viewer (at the right hand panel) suddenly became a widescreen mode rather than a full screen - means there is a gray area at the top of the bottom of the screen.
it does not improve if i change the viewer size at the Windows pull down manual.
No improvement even i reinstall the imovie and remove the preference .plist in the library.
Appreciate your help.