Lignthroom CC 2015, HDR and Panoarama .dng files don't show vignettes in Finder of OSX, only a black rectangle or DNG logo, idem with to extract to 7.1 DNG, but if to extract to DNG 5,4 the vignette is ok. Idem in On1 browser ? Is that a bug ?
Thank for test on Windows too.
Apple hasn't updated their raw support libraries yet to be able to understand the newest 16-bit floating point dng files Lightroom creates. So Finder can't generate a file icon to show you. Generally the dng support built into OS X only knows how to deal with dng files that are direct conversions from raw files from cameras it already has support for.
Tank's , this mail was sanded to Apple support. ! !