I have Poser 8. It also accesses the library left over from my Poser 4. I usually work in that Poser 4 library

Today it started not displaying my Poser 4 library properly :: e.g. controls including the slide were missing or did not work. This persised despite uninstalling and reinstalling my Poser 8.  Is this due to my Poser 4 library getting too big?

What is the allowed maximum size (in folders and in files) of a library under Poser 8? And under Poser 10?

Can I clear the jam merely by going into the Poser 4 library in the directory explorer and deleting some entries? Or what needs to be done?

Should I get rid of the Poser 4 library and transfer everything into the Poser 8 library? Or what?

Is it time I got Poser 10? How long would it take to come?