Nice file access works now like a charm. However, I've got these black bars, too.
here's an example dng:
https://www.dropbox.com/s/hvtpikxdtt6rpoh/M22-1922_000001.7z
here's an example dng:
https://www.dropbox.com/s/hvtpikxdtt6rpoh/M22-1922_000001.7z