I was using vpro9x32 by default, because I wanted to use Cineform. (But as previously stated, there was no sound.) I have not loaded the NeoScene x64 Beta yet, but would be interested to know how people find it.
Funny. As you suggested, I opened vpro9x64, and I get sound on the .MTS file! Project Properties is at 32-bit floating point (full range). I played through the timeline once, and so far it works.
Moving forward on vpro9x64!