I am not sure what happened. I know I had it before, but I recently reinstalled Windows, and all software. After I installed my Vegas Pro 11 (newest build 683), I finished up a project and I do not see an option to encode in ac-3 pro for use as a DVD and Blu-Ray audio stream. Is this not included with Pro 11? Was it using an old encoding option from the 10 I upgraded from? (I cannot do this anymore as I deleted my Vegas 10 download that I upgraded from) I am baffled, and quite disappointed if this is the case. I have even just reinstalled Pro 11 and still do not have that option. Any clues? I don't want DVD architect messing with my audio... I see ac-3 studio option, with no customizations available, and I know from past experience that DVD Architect still doesn't like this format without re-encoding.