I've got problems with a mask... I have an object with an image mask which uses a paint stroke as a source. That paint stroke has a behavior (write on). When I try to copy or duplicate all the group, and then I move the new group on the timeline (so that it starts before or later), the image mask doesn't work properly. I can see all the object for about a second, and then I can see correct with the image mask. And more... if I try to change the rotation of the group, the mask doesn't match correct to the image I want to mask (as if the mask wasn't rotating).