This message box displays in the wrong position:
Here's how I made this happen:
1)I tested a level in 2P mode, then talked to an NPC while the screen was split.
2)I tested in 1P mode, then, when I talked to the NPC again, the message box was on the left of the screen.
This bug doesn't go away unless I restart SMBX. Reloading the level or loading a different level doesn't fix it.