Can't answer your ESP specific issues because I use Infinite, However, Vue doesn't work with Daz Studio, it will work with Poser 5, 6, 7 and Pro!!
Daz Studio is set up to work with Carrara, that may have been a better option for you if you use DS!
AFAIK your Vue4 materials should be useable in Vue 7.
If you want good Vue tutes head over to Geekatplay!

Injustice will be avenged.
Cofiwch Dryweryn.