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Searching for the truth in my extension

After having the segmentation fault, I did what any good developer does: put cout to print messages all over my code. Thanks to it I was able to "fix" the line:
*instance = CApp2(RubyInt::internal(width), RubyInt::internal(height), RubyString::internal(scene_file));
into:
instance = new CApp2(RubyInt::internal(width), RubyInt::internal(height), RubyString::internal(scene_file));
I also found out that somehow some of my pointers that are instance variables of the C++ class are getting set to zero. That is why I now get a segmentation fault again because I try to use them when they are zero. Maybe Ruby is setting them to zero? but why? I could not find anything on the web to help. Look at the output from the ruby program: 
>ruby Test.rb


*** initialized CApp2 module ***



*** Done initialized CApp2 module ***



*** Creating instance ***
In contructor
b4 Assigning static m_pPhysicsWorld = 03016000
Assigning static
Finished static
Irrdevice = 03000EF0
*** Done Creating instance ***
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

*** Going to call init_object ***
In initobject have Irrdevice = 00000000
Irrlicht Engine version 1.2
Microsoft Windows XP Personal Service Pack 2 (Build 2600)
Using renderer: OpenGL 2.0.1
GeForce 6200/AGP/SSE/3DNOW!: NVIDIA Corporation
OpenGL driver version is 1.2 or better.
Loaded texture: textures/editor_defaults/default_skybox2.jpg
Loaded texture: textures/editor_defaults/default_skybox3.jpg
Loaded texture: textures/editor_defaults/default_skybox0.jpg
Loaded texture: textures/editor_defaults/default_skybox1.jpg
Loaded texture: textures/editor_defaults/default_skyboxup.jpg
Loaded texture: textures/editor_defaults/default_skyboxdn.jpg
Loaded mesh: ../../blender/ball.obj
Loaded texture: textures/editor_defaults/default_particle.png
Loaded mesh: ../../blender/box.3ds
>Exit code: 3

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