720p30 project in Apple Motion
Multiple layers in one group, probably about 15, when I go to export it simply doesn't render my two emitter layers in the resultant quicktime (exporting full-res hd 720p30 or otherwise.)
Export Selection any layers that are 2D and Import into Project as flattened Quicktimes. You can just make the old layers invisible after you've imported the new QTs. You should probably be able to reduce the number of layers and may have better luck exporting.