Turn off Just Scale for both 16:9 and 4:3 and try
Set 16: 9 to letterbox and 4: 3 to black pilar
Also check your TV's same settings. If they also are set to same settings just change to same as your Dreambox
In the future if this helps only do your settings in your Dreambox if you want to scale the picture
Thank you very much for your help. Apparently this problem has been solved with the image settings you mentioned.