As far as I understand it... Poser 6 opens up "pointing to" the last Runtime you used when you last closed Poser (unless of course, you closed via the task manager - not an unusual experience with Poser). So it will only try to read that specific Runtime when you start up. However, if you decide to switch Runtimes during your Poser session, it will then read all of that new Runtime (with consequent delay) before displaying the libraries. And, if you switch back --- it'll have to re-read the previous Runtime.. (although that might be quicker than the initial read if the OS caches the previous one, but that's out of Posers' control..) Quite how this reply will help (if it does) I'm not sure, but I hope it does.. Cheers, Diolma