Yeah..so true. Poser locks the folder when it hunts for something. If it finds it, it unlocks it. If not, it doesn't and you're stuck. I install everything to a Poser Install folder and run Correct Reference on the entire folder before I move the stuff into Poser. So basically for me locks happen when I'm searching through my Poser stuff with Explorer or organizing it. Or sometimes saved pz3's do it. Not sure exactly why. When I remember I reboot before opening Poser. Luckily XP reboots pretty quickly.