I am using Camtasia 3 for Mac. I shot a video which is narration to camera in the style of a newsreader. The original video is correctly sized. When I import it and drop it into the timeline, it shows on the canvas as about 25% of the space with black around it. I have tried changing the size of the video and other elements I've added in the properties menu via the scaling slider but have run into problems with this. Even when I have scaled my video, the final exported version is still showing as 25% of the screen. Can anyone help a newcomer to Camtasia?!