A question for film composers using Sibelius:

Just wondering if any one could assist me with a video playback issue with Sibelius.

I have managed to import a video into my Sibelius 6.1 session but for some reason it is not playing back the video? The video is a Quick Time movie which I have successfully used in Pro Tools before.

Any suggestions from film composing community using this feature with their notation program?

Many thanks in advance for any leads!