I am trying to get the height for the fire effect, and I can't seem to type in a number there. I can slide the slider to change the value, but if I try to type in "30" it doesn't work. I thought I might have hit the num lock button, so I have tried that different ways and with the number pad and the numbers over the letters. Seems like other effects can be typed in ok, just not there. Am I doing something wrong?