OK.
Try this instead:
1 – Create the NULL. Don´t rename it.
2 – Put three slider controls on it. Name the first X the second Y and the third Z.
3 – Put your image on the comp under the NULL and make it 3D. Than add an expression to the position(ALT CLICK). It´ll write something by itself (like transform.position) leave it there. After those first words write:
+ [
Then pickwhip to the X slider on the NULL. Put a , and pickwhip to the Y slider. Put a , once more and pickwhip to the Z slider. After that colse the ] Then type
* index -1;
Hit enter on the numeric pad.
Now you can duplicate the layers and move them through the NULL´s sliders.
I tryed it from scratch and it worked.
You´ve said you´re using AE 6.5, I´m on CS3 butI don´t think that´s the problem.
Well. Hope it works this time. It´s working here. I´ll try it tomorrow on my work PC (running AE 7)and on another that I guess has 6.5 and see how it goes.
Best luck there now. Let me know if you have more problems.
Cheers.
Adriano.Ninguem.