I would try K3B. I've always preferred it to Brasero.
Maybe your hard drive is close to full, since Vector doesn't automatically empty out the /tmp directory. Don't know if this is the case, or even if it is if it would affect the performance of Brasero when it's trying to write to a dvd, but it might. If there are various large files in /tmp occupying a lot of space (if your computer is near full), clear them and try again. Otherwise, as I mentioned, try K3B.