Lower track not shown during fade in upper track
I have a number of still images in the timeline. The timeline is 16:9, but the images are 4:3. They were shot with a gray background. I created a track that contains only a single clip with that gray color in a lower track which nicely fills the rest of the 16:9 canvas.
A problem occurs during crossfades between two images. As soon as the fade starts, the area outside the images changes to black, even though the lower track containing the gray color is just one clip across the entire sequence.
Obviously, what I want is to keep filling the canvas with the grayish color while the fade between the images happens. Hope this is clear.
How can I accomplish that?
Thanks