At least Poser 8 hasn't crashed on me yet.  Poser 7 crashes all the time and is slow saving scenes.  I'm going to use Poser 7 until the SR1 comes out.  I do like the Library better than in earlier versions, but the scroll bar issue makes it difficult to work with because as you said it disappears or is so tiny it's hard to grasp onto it.

The scroll bar for the Library should also be on the left side, not the right.  Widening the library to get to the scroll bar just wastes more space.  I don't need to read all the entry text in the library.  The image is good enough.

Poser 2, 3, 4, 5, 6, 7, 8, 9, 10, Pro 2014, 11, 11 Pro