Jacob
 I have added a feature to sort volumes by B-value. You can enable or disable this feature using "-b y" / "-b n". A lot of changes were required since we have to reorder the bvalues, bvectors, volumes and also detect and expunge ADC maps from Philips data. Since I do not have a Philips system, I would suggest you validate the latest version (v1.0.20170821) before we release it. 
  https://github.com/rordenlab/dcm2niix
Since one can toggle this option on and off, it should allow some transparency for troubleshooting acquisitions.