Just to add to this- all early ones do this. Audioquest’s ‘solution’ was to basically fill the case with glue which stopped the rattle at the minor cost of ensuring that the unit is completely u/s if anything goes wrong with it.
Mac OS X & iOS Related
Can I use DragonFly with Mac OS X?
Yes. DragonFly Black, Red, and Cobalt are compatible with OS X (starting with OS 10.6.8 to present). There are no known compatibility issues with OS X.