Thanks for the screenshots but your timeline would be more helpful. The shot that's all black gives us no idea of how you are using the layers or which layers are using multiply. My first guess is that you're using Ray-traced 3D for in the comp which does not directly support blend modes. Blend modes are nothing but math and as long as there's some room to make calculations the blend modes will show different color values unless you're setting up the comp using some procedure that overrides the rendering order or does not support the math.
Please send a screenshot of the entire composition and the timeline ad a description of the layers so we can get some idea of how you are setting up the comp. If you are not using Ray-traced rendering in that comp there's something else going on that we can only guess at.
Thank you for your reply, below i posted some shots of my timeline. in both carcomps the multiply function does not really show. aslong as it does in my final comp. I have no problem with that.
this is the one thats not working.
Just to be clear...the bottom layers is the shadow layer.
the background colorwhite is not a layer
this one works in the final comp. Obviuosly this one has more layers because im animating the wheels .Again the bottom layer is the multiply layer. both made multiply by selecting the layer and using the ctrl key.
I dont know expressions (yet) so im keyframing by hand.
and here the final comp with both the car comps opened in the timeline.
hope this is clearer.
thanx so much for your time.
It sounds as is you want to stay in 2D, which is just fine.
If that is true, try bringing the background comp into the comps with the trucks. The shadow layers should then work as you expect against the background layers.
I just found out what it was!...
apparently this little sunsymbol belonging to the non woking comp was not switched on in the final comp . I feel pretty stupid that this was it...but glad that it works.
It needs to be 2d. this is the style that the client aproved. Indeed adding the background comp in my truckscomp wouldve made it work...I tried that...but it would have messed my system up. and as you know...im no expert in after effects yet