Problem in Chapter 2 of Paper Mario TTYD

[nymets10]

I downloaded Dolphin to play Paper Mario: The Thousand Year Door. The game runs smoothly through the prologue and first chapter (although the X-Nauts in the opening scene all appear as only shadows and a few pixels and the Punies' jumping doesn't quite register, which I've heard is a common and unfixable problem for now) but whenever I get to a certain point in the Great Tree, the game crashes and the emulator quits out. I posted a youtube video showing exactly where this happens as well. Can someone clue me in to why this is happening and what I can do to fix it? Also, I'm pretty new to this, if I left any helpful information out, just tell me and I'll try and find it.
http://www.youtube.com/watch?v=MEjn0i6N1OY
Specs:
Macbook Pro with OS X 10.6.8 and Intel Core 2 Duo Processor
4GB memory
NVIDIA GeForce 9400M graphics

[ExtremeDude2]

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banhammer

[DacoTaco]

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