I use Toast 6 Titanium both on an iMac G4 and a Mac-Mini G4 that run OSX 10.4. Toast works perfectly on my iMac. On the Mac-mini, when I get to the point of burning a DVD, I get this error message:

"DVD_VIDEO_RECORDER" could not be unmounted. All open files and programs on this volume must be closed first.

I have no other programs open. I didn't always get this error. I reloaded Toast 6 from disc and I still get the error. Both computers have been updated alike.

Thanks,
Dan

Try trashing the Toast plist and prefs files in your User>Library>Preferences folder and relaunch Toast.

Thanks for the suggestion. I had partial luck. When I insert a DVD (this is a self-burned demo reel) and click the red Record button, it says

"Mr_E_DVD" could not be unmounted. All open files and programs on this volume must be closed first.

That was the name of the DVD I was given.

If I choose "Save as Disk Image", I was able to burn the image to DVD. Since Toast works on my iMac at home, I guess it must be something with how the Mac-mini software is configured.