Thank you for the information..., I've rebuild the cloud system and now it works as I espected..., but now I'm afraid of find this error when I render the entire animation, since I can not be sure of that now and I'm wondering if I will be fired because of an error which will be too late to fix (if it can be fixed) or if I'll be able to fix it (I'm new to this program although I have vast experience with other 3D packages.