South Button Unable to Start Game

Hi, everyone.

I have a Blaze twin player arcade stick that I using with Retrobat. Everything seems fine except the South Button (or X for PlayStation controllers) does not work in the game selection screen.

The button works fine otherwise. I can navigate the menus and press South to enter any option.

So, for example, I can navigate to "Mame" and hit South. It will then enter the Mame game selection screen.

But when I get to the game selection screen and go to a game, the game does not launch when I press South and game options don't open when I press and hold South.

Any help is much appreciated.

Thank you.

Toby