Running full screen @ 720p

Hi

Due to a hardware failure I’ve had to move my Kodi setup to a new machine.

I was running at 720p so that I could display Kodi on my HD TV and a old 4:3 monitor, this was working fine.

I’ve tried to recreate the same setup on the new system but when I launch Kodi it will only display in a quarter screen, running Kodi in windowed mode allows me to get the display near full screen but I have a top border which I cannot get rid of.

It doesn’t matter whether I have the two screens cloned or not I get the same results.

If I just run on the TV at 1080p then I have no problems getting Kodi full screen.

Any ideas?