If they were the same character, with the same texture, and imported both as .obj, I can't see any particular reason why it might have happened. The one on the right sort of looks like what happens when you export from Poser as .3DS, though. Could be either Poser or Vue had a little "burp", or maybe it was Windows. Could have been a memory thing. Poser 4 starts acting funny after a couple of hours without rebooting, at least on my system. And of course, Vue 4's material editor often has some unique surprises here and there. ;) But, Agiel's right, it's easy enough to fix, and the PZ3 import seems to give better results than .obj anyway.