Another reason to use external multiple runtimes (or even one external runtime).  The only things I add to the Poser 6 runtime folder are python scripts (but I keep a backup of that on another hard drive too), and materials (but I also keep a backup of those  too)

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi