Thank you, I’m an idiot.
I’ve been working with the same timeline set in Vegas for so long (Time & Frames), I forgot that I even needed to change that in DVDA. That corrected my video length “problem” — operator error. 🙂
But what about this?

This is what I meant when I said that the audio shows up as 1-3 frames (based on the Time & Frames ruler setting) shorter or longer, depending on the specific clip I’m working with?
Is this just something I should ignore? (Particularly considering that you’re looking at a 59.94fps Project — double-checked the settings — and DVDA is still showing only 30 frames on the timeline ruler?)