Thank you so much Ron for answering so quickly!
I already found the link you sent, so I learned this during my first movie. Today I opened up VS12 ProX2 and saw that there was a tick box on the opening screen for selecting 16:9...
Must have been so eager to start the software that I did not look good enough! To be honest, I think that you should be able to select settings when the software has opened and start a new project... But anyway, I have ticked the box now!
So this might explain that with the titling I added, I was not able to use the complete width of the movie, but a box that looked like a 4:3 box...? The project assumed that I was using both 16:9 and 4:3 sizes in the same movie.
The titling track has forced to show in 16:9, but when this was not used, it jumped to 4:3.
I did not use the Overlay track at all. I have put still images on the video track. That is correct, isn't it?
Thanks again for your help!
Jacqueline