???

Hi guys, I'm new at this site and encountered some problems, specifically afterburners.  After moving, deleting, copying and pasting.  I finally got the afterburners to work.  However, once I activate the lights, the afterburner lights up at idle and it looks "blockie" a sequence of squares that makes the visual afterburner look, instead of an actuall visual flame.  I did the intructions, adjust my graphics and all.  I'm at my wits end.  The same effect happens to the VIPER's afterburner and wing vapor, but not the wing tip contrails.  Any help is greatly appreciated.  Thanx.