Game crashes on a new Mac Pro

[Rikoshay]

I recently (Jan. 4) purchased a new Mac Pro (8 X 3 Ghz processors, 8 Gb RAM, ATI 1900 graphics card) that should run ANY game that comes out for a Mac. Penumbra: Overture
continuously freezes in the first 15 minutes of play, necessitating a complete reboot. It doesn't freeze in the same spot each time, but usually shortly after starting play. Please advise. Here's my log:

-------- THE HPL ENGINE LOG ------------

Creating Engine Modules
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Creating graphics module
Creating system module
Creating resource module
Creating input module
Creating sound module
Creating physics module
Creating ai module
Creating scene module
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Initializing Resources Module
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Creating resource managers
Misc Creation
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Initializing Graphics Module
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Init low level graphics
Setting video mode: 1280 x 960 - 32 bpp
Init Glee...OK
Setting up OpenGL
Max texture image units: 16
Max texture coord units: 8
Two sided stencil: 1
Vertex Buffer Object: 1
Anisotropic filtering: 1
Max Anisotropic degree: 16
Multisampling: 1
Vertex Program: 1
Fragment Program: 1
NV Register Combiners: 0
NV Register Combiners Stages: 0
ATI Fragment Shader: 0
Creating graphic systems
Creating Renderer2D
Renderer2D created
Creating Renderer3D
Load Renderer3D gpu programs:
Extrude
'ShadowExtrude_vp.cg' using profile: 'arbvp1'
Diffuse
'Diffuse_Color_vp.cg' using profile: 'arbvp1'
Fog
'Fog_Solid_vp.cg' using profile: 'arbvp1'
Creating fog textures: Solid Additive Alpha
init sky box
Renderer3D created
Creating screen buffers size 1280.000000 : 960.000000
Creating programs
'PostEffect_Blur_vp.cg' using profile: 'arbvp1'
'PostEffect_Blur_Rect_fp.cg' using profile: 'arbfp1'
'PostEffect_Blur_2D_fp.cg' using profile: 'arbfp1'
'PostEffect_Bloom_vp.cg' using profile: 'arbvp1'
'PostEffect_Bloom_fp.cg' using profile: 'arbfp1'
'PostEffect_Motion_vp.cg' using profile: 'arbvp1'
'PostEffect_Motion_fp.cg' using profile: 'arbfp1'
'PostEffect_DoF_vp.cg' using profile: 'arbvp1'
'PostEffect_DoF_fp.cg' using profile: 'arbfp1'
RendererPostEffects created
Adding engine materials
--------------------------------------------------------

Initializing Sound Module
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Initializing OpenAL.
Trying to open audio device... Success!
Device name: Built-in Line Output
OpenAL Version Supported: 1.1
Number of channels: 32
--------------------------------------------------------

Initializing Game Module
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Adding engine updates
Initializing script functions
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User Initialization
--------------------------------------------------------
Initializing Penumbra: Overture Episode 1
Version $Rev: 1842 $
Date $Date: 2007-11-19 19:26:11 -0500 (Mon, 19 Nov 2007) $
Checking Supported Profiles
Profile CG_PROFILE_ARBVP1 is supported
Profile CG_PROFILE_ARBFP1 is supported
Profile CG_PROFILE_GLSLV is supported
Profile CG_PROFILE_GLSLF is supported
Profile CG_PROFILE_GLSLC is supported
Trying to load vertex program!
'Test' using profile: 'arbvp1'
Success!
'DiffuseSpec_Light_vp.cg' using profile: 'arbvp1'
'DiffuseSpec_Light_Spot_vp.cg' using profile: 'arbvp1'
'BumpSpec_Light_fp.cg' using profile: 'arbfp1'
'BumpSpec_Light_Spot_fp.cg' using profile: 'arbfp1'
--------------------------------------------------------

Game Running
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Loading collada for 'maps/level01_02_mine_entrance.dae' took: 246 ms
'BumpColorSpec_Light_fp.cg' using profile: 'arbfp1'
'BumpColorSpec_Light_Spot_fp.cg' using profile: 'arbfp1'
'Diffuse_Light_vp.cg' using profile: 'arbvp1'
'Diffuse_Light_Spot_vp.cg' using profile: 'arbvp1'
'Bump_Light_fp.cg' using profile: 'arbfp1'
'Bump_Light_Spot_fp.cg' using profile: 'arbfp1'
'Fog_Trans_vp.cg' using profile: 'arbvp1'
'Diffuse_Light_fp.cg' using profile: 'arbfp1'
'Diffuse_Light_Spot_fp.cg' using profile: 'arbfp1'
ERROR: Couldn't find particle system file 'particle_dust.ps'
ERROR: Couldn't create particle system 'sust01' of type 'particle_dust'
ERROR: Couldn't find particle system file 'dust_sust01.ps'
ERROR: Couldn't create particle system 'particle' of type 'dust_sust01'
ERROR: Couldn't load particle system 'particle' with type 'dust_sust01'
Start Num Of: 96
Start Num Of: 8