DVBDREAM Image size problem

I have an unexpected problem where the image (picture) is small and at the top left of the area the image would normally be.

I have looked at the settings and am at a loss to restore it to it's normal size.

If I try selecting 'full screen' I just get the same size image at the top left of the full screen.

I am obviously missing something simple.

How do I get a normal size image back?

Yes, now fixed.

Something changed the video rendering settings and I eventually found the cause.

All is well now.

I have no idea what changed the settings.
It was working fine.

I was in the process of using a spare computer in the living room so I could watch feeds on the larger television.