Having returned from my daily joy (I make people feel small for a living), I am able to look closely at your scene as described. I note you use the phrase "Lowest posible res textures in each case" in your list. According to the person from whom I am getting my information, that means that those textures are roughly 2048 by 2048 in memory, and effectively 16 million colors at the minimum, for each figure. That means 10 textures for the people, alone. Even with the texture resolution limitation (which only applies at rendertime and only to calculations performed), those items are going to occupy between 1 and 1.5 GB of memory all by themselves (images are stored uncompressed in memory). That does not give you much play room for shadow maps, calculations, mesh storage, file storage (10 CR2s with all the joint morphs is still a lot, and the joint morphs are not injected), and similar. It is suggested (I am discusssing this via IM at present) that you open the textures for each of those figures that are in use and save out a copy of them at a 1024 by 1024 size. The squaring will not affect the texture. Then apply those resized versions and attmept your render again. Also, check the size of shadow maps if still in use -- there are some lightsets that use extremely high numbers that are a holdover from earlier versions and are poorly suited to the lighting features in Poser 5 and 6. Shadow maps above 1024 should be used with extreme caution and only if the shadow cameras are properly set for the scene, and shadow maps of 2048 are a waste of resources. After that, give it a shot at rendering.