Toast won't burn!

What is wrong with toast? I go through the normal proceedure of copying one of my movies from an existing DVD and it now says there is a hardware error and can't burn the disc.

Hardware error? I find this hard to believe as everything else related to the DVD burner is fine, i-DVD still works ok and I can still watch movies.

I suspect it is a software error and that Toast is trying to pass the blame onto the hardware and not take responsibility for it's new found flaw.

How can I get things working again? ...Do I need to reinstall it and can this be done without internet access?