Acadia:   *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)

*infinity10:  *Yes, Poser 7 will remove all runtimes under it, if you uninstall.  I seem to have had that experience before.  Thankfully, I had a backup of my runtime's installed content and projects-in-progress.

*External runtimes won't help, then - only ones entirely backed up to where a new Poser (re-)installation can't find them?