Problem with Toast 7 after upgrading to OS 10.5

[dv-cgartist]

I have recently upgraded to OS 10.5, and love all the new things about it. I have had no complaints about the OS until today. I have been making back-ups of some of my older DVD's by ripping them with Mac the ripper, and then making a copy of the DVD via Toast 7. I just tried to burn one of the DVD's and after compressing it (in toast) and error came up saying "could not record the disc because of a Mac OS error".... anybody have any ideas????