Oh and for the record, I now have Poser 7 rendering the exact same animation file and it's looking to be at least three times as fast as Poser 6 and I don't see any leaks yet in Task Manager on Frame 125 of 801 so far.

So, my conculsion is "Not ALL versions of Poser have the memory leaks" when rendering animations. Not saying they don't all have some memory issues, but the animation leak seems to be in Poser 8 only for me so far. I haven't tried rendering the animation in Poser Pro yet.