about 50% of the time that I've ripped a CD, then after some preparation (IFO EDIT and them DVDtoOne, IFO Update)
I burn to DVD-R with CopyToDVD with some error messages, but the DVD continues to burn, and works. Here are the error messages:

BUP/IFO of Video Title Set #xxxxxx contains error. The resulting DVD may not work.

Does anyone have any inside info. on what is causing this?