Video clips black when viewed full screen or exported?

I'm just taking my first steps with iMovie - apologies if this is a real newbie question or a FAQ (I have searched for answers already without success).
I've imported some video from my camera (Pentax W90) without a problem. I've split it into clips, selected sections, and added some simple titles and effects - all seems quite easy. I can view my new movie with no problem in the preview window.
However, if I try to view the movie full screen, or export it, the video content is all black. The titles are fine, just none of my video footage. I've tried exporting in various formats and sizes and it's always the same.
Where did I go wrong and how can I fix this?

*edit
Found workaround for this problem on web.
1. right click on itunes on your desktop and go to properties.
2. click on compatibility tab
3. check box for "Disable display scaling on high dpi settings and apply.
You will get a warning when you open itunes now that display settings are now set to an older version or something like that but just hit ok....and now full screen video! Probably isn't quite as clear as it should be if apple fixed this problem (I mean come on I know there have to be a ton of us out here that use large lcds or plasmas as our monitors so why its not fixed beats me) but hey at least it works in fullscreen mode this way. The major problem with this workaround is that it makes it quite hard to see text and other things in itunes store because they are now quite small. So what Ive had to start doing is keep it on normal settings while I go into itunes, and do my searching and renting and buying videos, then close it, make the changes of the workaround and then reopen it so that I can watch in fullscreen. Yeah its a pain but it works.
Message was edited by: batou01

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