It seems that there is some confusion about DNG files processed using Brumbaer tools looking underexposed.
However, the same image processed into a DNG using Exposure looks properly exposed. I have a hunch that the downward shift of values from Brumbaer is to accommodate highlight recovery.
For those who are not familiar, Brumbaer is an *alternative* workflow for the Sinar eMotion backs. I have not used it until recently, and found it to be better than Exposure at higher ISOs. However, I generally use base ISO in my work so this is just about getting to know my gear better.
Anyway, to put everyone's minds at rest, here is a link to a ISO 400 DNG file created by Exposure, followed by the same exposure but created in Brumbaer. Open them both and you will see a large apparent difference in exposure.
Despite this, they are both ISO 400 captures! I hope this clears things up