I incorporated my rendered video in DVD Architect 7, Build 67, and things are not going well.
Moving around in the timeline takes forever to create pinpoint chapter markers. After I painfully got all the markers in, the menu that shows all the chapters is black - only when I cursor over can I see the chapter links, but they are beige without any text or graphics.
Also, when I converted the HD file to SD and brought it into Architect for a DVD creation, the audio is all distorted.
I've been using Vegas / Architect for about a dozen years now, and have never encountered problems like this. I've tried another computer, with similar results. I've also created similar sized projects in the past without issues using version 10 - I updated to 15 and now am encountering these issues.