Particles are forced to set to glColor4f(1,1,1,1) unexpectedly

Hi,

I am currently having a problem with the particles color.

It worked normally until I moved the camera higher up, the particles will somehow be forced to set the RGBA to all 1. The Y position of the camera is consistent at a point to trigger the bug within the same level scene, but the Y position to trigger the bug, will be different in other scenes.

I tried directly added the lines to change the color to values other than glcolor4f(1,1,1,1) in the renderObject() in t2dParticleEmitter.cc like this:

// Draw Object.
        glBegin(GL_QUADS);
            glColor4f   (1,0,0,0.3);
            glTexCoord2f( minX, minY );
            glVertex2fv ( (GLfloat*)&(pParticleNode->mLocalClipBoundary[0]) );
            glColor4f   (1,1,1,0.3);
            glTexCoord2f( maxX, minY );
            glVertex2fv ( (GLfloat*)&(pParticleNode->mLocalClipBoundary[1]) );
            glColor4f   (0,0,1,0.3);
            glTexCoord2f( maxX, maxY );
            glVertex2fv ( (GLfloat*)&(pParticleNode->mLocalClipBoundary[2]) );
            glColor4f   (0,1,0,0.3);
            glTexCoord2f( minX, maxY );
            glVertex2fv ( (GLfloat*)&(pParticleNode->mLocalClipBoundary[3]) );
        glEnd();

The moment I crossed the bug triggering Y position, it will force all particles to glcolor4f(1,1,1,1);

I tried to search around the source codes, but I'm quite lost at where is the code that is affecting the particles.

Any help on this, will be much appreciated =).