Manual fire color not working

I’m using the LightWave version and I can’t get the Manual Color mode for the fire color to work. As you can see in the screen grabs BlackBody works fine, but as soon as I switch to Manual Color mode the fire disappears. It happens when I set a default color from the Color & Opacity tab I doesn’t work, and when I click the texture button and try using a gradient with the Fluid Channel input or Previous Layer input I get nothing. Those are the only 2 inputs available, and I’ve also tried using procedural textures with no success. I’ve read the manual but there is no information?