Vertex Program Woes

I've been having problems using vertex programs with vertex arrays on my machine. This produces the correct image on my screen

void drawNormal() {
	glBegin( GL_TRIANGLE_STRIP );
	
	for( int i = 0; i < kNumPoints; i++ ) {
		glVertexAttrib3fvARB( 2, gColors + 3 * ( kNumPoints + i ) );
		glVertexAttrib3fvARB( 1, gColors + 3 * i );
		glVertexAttrib3fvARB( 0, gPoints + 3 * i );
	}
	
	glEnd();		
}

This code (which if I read the spec properly is equivalent), however produces the dreaded black screen

void drawVA() {
	glEnableVertexAttribArrayARB( 0 );
	glEnableVertexAttribArrayARB( 1 );
	glEnableVertexAttribArrayARB( 2 );
	
	glVertexAttribPointerARB( 0, 3, GL_FLOAT, false, 0, gPoints );
	glVertexAttribPointerARB( 1, 3, GL_FLOAT, false, 0, gColors );
	glVertexAttribPointerARB( 2, 3, GL_FLOAT, false, 0, gColors + 3 * kNumPoints );
	
	glBegin( GL_TRIANGLE_STRIP );
	
	for( int i = 0; i < kNumPoints; i++ ) {
		glArrayElement( i );
	}
	
	glEnd();
	
	glDisableVertexAttribArrayARB( 0 );
	glDisableVertexAttribArrayARB( 1 );
	glDisableVertexAttribArrayARB( 2 );
}

The vertex program does colour morphing according to the vertex attributes 1 & 2 and a program enironment parameter (elsewhere) First, am I right in thinking these bits of code are equialent? And if so any idea what else could be going wrong? If not what am I missing? I've reduced it to a test program that draws a single square and swaps between the two modes at the push of a button if that will help. [edited by - pjstirling on May 11, 2004 4:22:17 PM]