well, its not apple's fault if quark is too lazy to translate their software. but any who. toast is a separate app, that does not come with the os. so no on using the os install disk to reinstall the app. it might be on a extras disk, or on its own install disk. truth be told, i have toast, but never use it due to being able to do all my burning with either the finder, or from within other apps, like itunes. but on to deleting the prefs, log in as the user having trouble, and goto the folder "user_home>library>preferences" then find one named something like "roxio toast prefs" and move it to the trash. now launch the app, and try burning the disk again. something else you can try is creating a new user account, and seeing if it has the same problem. if it does, then there's a app/system wide problem. if its ok, then there is a user account problem.