Computer & Console Cores Split Vertically?

[mrmul8r]

Just hooked up my PVM to MiSTer,

Arcade cores display perfectly, as does the MiSTer menu (F12).

However, when I load either a computer or console, I get two images side-by-side with a black gap in the middle of the screen.

Any ideas what is causing this?

Cheers

[Hectic]

Check if u've turn on the scandoubler. if it then turn it off.