I've returned to have another stab at kdenlive. I'm trying to render some text on a video. I've added a title clip with the desired text & colour. I see it appear in the project tree. I drag it down onto the timeline. I've also managed to get a 'composite' effect ( or something ... a red box thing in the timeline ), placed it over the video and title tracks. Nothing happens - I only see the video in the preview window. Also if I export, I only see the video. I've tried playing with the 'Opacity' setting. This also has no effect.
How do I get the title track composited over the video?