It's been an ongoing dispute about where to keep the main character files.  When I used P4 it was required because P4 didn't recognize external runtimes.  

When P5 came out I still had to keep the main character files in the Poser Runtime or Downloads runtime because P5 was slooooooooowwwwwww loading the morphs.  

When I got P6, and this is only my experience, I didn't need to have the characters in the main Poser folders and moved the installation out to the external runtime and it all worked just fine.  Same with P7.

Some people had problems in P6 with the character deltas if they weren't in the main content folders but I never did.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.