I work with Poser 5 and 6  and Vue 5 Infinite all the time. I bring in Native Poser files with dynamic hair. I use basically nudes so I do not have clothing to worry about. I have never converted them to vobs. They do not crash on my and the import perfectly other than changes I make to the hair.

I have almost never had a system crash and only a few low resource messages since I started using it where I had plenty of time to shut it down and reopen it. I am using the latest update and it works great. I have never crashed during a render. Now I do not render huge files. If I want the image to be large, 16"x20" at 300 dpi, I use Genuine Fractals PrintPro 4.1 in Photoshop after I have rendered the image.