Just got off the phone with D&M, after they emailed me that a fix was available for the file format issue recording at 24 bit.
The good news is that there is a firmware upgrade that lets you select in the menu 24 bit old-style, compatible with Wavelab 4.0 etc., 24 bit -E for the new Microsoft 24 bit format, or 16 bit.
The bad news is that you have to ship it to them for the upgrade, as for the 670 upgrades, no downloadable software like for the SD 722 or Edirol R1. They promise a one day turnaround. Mine goes out tomorrow.
Jeff