"5.1 Blu-ray discs authored by DVD Architect now play correctly in external players"
Perhaps true (although I've not tested it). But there is STILL an issue when previewing the .ac3 audio in DVDA7 i.e. the audio is panned right unless the Dolby Pro encoder is used in VP14. See my post here: https://www.vegascreativesoftware.info/us/forum/ac3-pro-render-missing-in-vp14--103633/#ca663430
The solution is SOOO simple and yet you will not "budge" on the issue!!!