Hurray, Vue 8.5 finally restored Spacenavigator support for the mac! There's a small process to get it working correctly, though. For anyone searching for this, here are the steps:
1. In your Vue project, click on "Main camera" in the "Objects" panel on the lower right.
2. In the "Aspects" panel on the upper right, uncheck the lock icon next to "Height." This will enable you to raise and lower the camera.
3. At the top of the row of icons on the left of that panel is a circular icon that looks like a target or a potato chip. When you mouse over it says "Always keep level." Uncheck it.
4. Go to the 3DConnexion control panel in System Preferences and adjust the sensitivity to your liking. I increased it quite a bit.
And that's it! Should work fairly well now. The only thing missing seems to be left/right tilt, but I can live without that.