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Shader not showing in xz plane

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when I apply my shader to a plane in the xz coordinate plane it doesn't show.
However if I make a simple changes and change it back again to the original xy coordinate plane it does show.

Not working example:


glBegin( GL_QUADS );
glTexCoord2f( 0.0f, 1.0f );
glVertex3f( -1.0f, 0.0f, 1.0f );

glTexCoord2f( 1.0f, 1.0f );
glVertex3f( 1.0f, 0.0f, 1.0f );

glTexCoord2f( 1.0f, 0.0f );
glVertex3f( 1.0f, 0.0f, -1.0f );

glTexCoord2f( 0.0f, 0.0f );
glVertex3f( -1.0f, 0.0f, -1.0f );


Why is this and how can I fix this?

Thanks in advance,


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