Most likely the file has to be compressed so you can't burn it in toast under the Data tab DVD-ROM (UDF), you'll have to burn it using the Video tab and then choose Formats and DVD-Video from VIDEO_TS and have Fit-to-DVD video compression checked.
Sorry, kind of forgot about this thread. Just in case you're still having problems, make sure you have selected De-Macrovision in MTR before doing the rip