Very very dark video in FCP X viewer.

Sort of getting to like FCP X.

I am getting very very dark video in my viewer. The clips look fine in the clip viewer (sorry if thats the wrong name but I mean the central window) but as soon as I select a clip and scrub through it the clip itself goes very dark and the clip playing in the viewer (the large window on the right) is very very dark, I would say maybe three stops darker than it should be. I have output a couple of clips as a QT mov file and they play just fine in QT it's just that they are showing up very dark, to dark to edit in FCP X.

Any ideas?

thanks.