Using animated transparent motion graphic isn't working

I have a service called Digital Juice that I use for additional graphic elements. For some reason the motion graphic elements with a transparent background or an alpha channel do not work in Adobe Rush. They WILL work for the first time I play the motion element in the timeline, but after the first time the background becomes white or black. Is there anyway to fix this. 
Digital Juice provides multiple formats to download but each that I have tried did the same thing. Thanks for your help.