I should let this thread die now that we've discussed it enough. I just wanted to add that I think it's a shame that companies don't admit their known bugs and post a truly helpful faq. The Poser faqs I've read always seem to assume I don't know what I'm doing when instead the program isn't behaving as it should. Surely CL know where this leak is and what will cause it to show itself. I would like some official statement like "Poser5 fails to return memory from raytraced shadow lights", or whatever it is that leaks the memory...