I must have clicked on something by mistake.

IF I resize the video preview window there are black edges all around it.

This is h def footage 1480 x 1040 so the black edges are not from having shot in a lower resolution but something to do with settings on the preview window.

Does anyone know how to reset it?

I.e. that when i resize/enlarge the preview window the black edges appear.

I already tried resetting it to original default settings but that did not work.