Patricia, if your only problem is a corrupt user.obp you don't need to re-install Bryce. If the Bryce 4 user.obp came with any presets (I went from Bryce 3 to Bryce 5, so I don't know) just copy user.obp from the CD. If it didn't contain anything then simply delete or rename your user.obp (rename it to oldbad.obp, for instance). Bryce will run quite happily without it. To create a new user.obp, start Bryce, go to the Create menu, select Installed, and select one of the object lists under that (Imported Objects, for example). Select any two objects (select one, hold down shift, and click on the other). Then click on Export, and when the Browse window comes up go to (Bryce home folder)>Objects>User. Save your export as user.obp, and, hey presto, a new user.obp file! You can then start using it as per normal, and when you've added some more objects you can delete the first two objects you used to create it. As for copying your other preset libraries, good idea, even if you are not going to re-install Bryce. If you are going to re-install, copy all your preset files to a set of folders outside the Bryce installation folder, re-install, and copy them back in, as you say, overwriting the "vanilla" installation versions. Good luck!