Hi Craig,
Try this, I've found this very useful.
1. Add the files to the timeline and edit as before;
2. Click on the 'Produce' tab and produce your work to a file that matches your required final output to dvd/blu-ray exactly;
3. Go back to the 'Edit' tab - this newly created file of your work should now be in the library;
4. Remove all the clips on the timeline and replace with your newly produced file. Check the newly produced file for any encoding errors;
5. Add chapter markers if required;
6. Select 'Create Disc' and select settings that match the file of your produced work.
7. Burn disc
Let me know how you get on!
Andrew
Alienware Aurora ALX R4 - Intel i7-4820 4.2 GHz - 32GB DDR3 RAM - Crucial 512GB SSD - 1TB Seagate HDD - 3TB WD Green HDD - 4TB WD Green HDD - MSI NVIDIA GTX 1070 8GB
Sony HDR-PJ810 and HDR-PJ530