Problem with using a Gamecube Adapter for SMBX

[MariowiiX]

Hello, Guys.

I heard this game through a video saying it has multi-player splitscreen. This got me hooked to the game, so I downloaded it to play with my brother. I'm using the Official Gamecube Adapter with a third party driver. The Gamecube controller's buttons work fine. I have 2 problems:
a) When I try to go into Daisy's Castle, the second player immediately goes back through the door.
b) When the second player talks to a toad, there's no way out of the text box.

I have a question as well: What's the recommended layout for using a GCN Controller for this game?

Please answer what you can, and you'll be very helpful.

[CraftedPbody]

I'll try and experiment on the controls myself in the future and I might get back to you on that, that's actually an interesting question.