Quiver plot: Arrow heads not visible, on wrong plane

Hi!

I have a little problem using the quiver3 command: I'm drawing a 3D quiver plot. Afterward I change the perspective

quiver3(x1,y1,z1,x2,y2,z2,0,'*','ShowArrowHead','on','LineWidth',1,'MarkerSize',2)
az=90;
el=0;
view(az,el);

The problem: The arrow heads are not visible in this perspective, i.e. I'm looking on the yz-plane, but the arrow heads are being drawn on the xz-plane. So all I see in my figure is lines with no heads. What can I do to solve this?