Images did not appear on projector

The images (songs) did not appear on projector screen even after setting to “go live”

Do cover the basics first - do you have the projection window visible?

If I am using a Powerpoint slide, it appear to the projector screen. But when I am using the Quelea now, it used to appear on the projector screen when we used it at the church last Sunday. Thank you for responding.

Does the guide here help at all?