Game Freeze Upon Choosing ZSS

[Sajiao Omelette]

Hi!

Like the title suggests, the game freezes at the stage select screen if I hold L/R while choosing Samus (and the little icon shows ZSS's head) after I choose a stage.

The game also freezes when I transform into ZSS from Samus in the middle of a match by taunting.

What could cause something like this to happen?

I'm USB loading (using CFG) and I have no costume, moveset, etc. hacks on either Samus or ZSS. The only hacks I have on my ISO are menu, music, stage textures, and Japanese sound effects.

Thank you very much in advance! :)