I confirm viewer and render problem with V8 on both 12 cores MacPro with 10.6.8 and 10.7, rendered frames DPX or quicktime have frames with colored lines, random, never the same, looks like a GPU problem… CUDA updated… GPU’s are GTX 285 on both machines, 10.6.8 with 3 GPU, 10.7 with 4 GPU.