I'm still trying to determine what causes it specifically. I tried a couple of combinations this morning..
1. Left the object untextured, still got the glitch
2. Set shadowing before texturing the object, still got the glitch
3. Moved the ghosted plain well away from the shadowed object, still got the glitch
So, I can't pin point what makes it occur. Interestingly though, if I only shadow the rotor, and not the main body (two separate objects) then the rotor's shadow is ok.
While we're talking about shadows, anyone know why it's misaligned?
Perhaps the shadow/ghosting problem is caused because the ghosted plain is glued to the main body of the helicopter? Hmm.. I'll have to try that when I get home.