My DVDs come out great. Don’t fault the software…..
Many times crazy issues are caused by the smallest thing, thus easy to overlook.
If you have the time & ability, wipe the system drive clean with a reformat and reinstall Windows. Install Vegas and DVD Architect and NOTHING ELSE. Make your DVD and hopefully it comes out perfect.
If the DVD is good, reinstall the programs you need ONE AT A TIME, and make another exactly same DVD after each install.
You should be able to find the cause of your issue.
Dave