Hi Edward,
Here are the specs: MacPro, 2×2.8 quad Xeons, 14GB of ram, running OS 10.5.8 and AfterEffects CS5.5 with 3D Invigorator PRO v5.0.6 when first encountered this issue, but since updated to v5.0.7 where similar render issues remain. I’ll email you the AE project. Thanks for your help to resolve.