This whole thing is just so fragile. My Poser library disappeared with the last Windows update. Unchecking the option for automatically detecting the local intranet sites and adding localhost fixed if. For now at least. I don't know whether IE still works for other stuff, I use Firefox normally.

I hate wasting time fixing problems that crop up magically, I don't need the new Poser 8 features that badly, so I went back to Poser Pro.