Lightroom 4 and the Leica M monochrom

When I import files from the M Monochrom there are no actual previews in the import dialog window. Also LR4 does not indicate the aperture used in either the library or develop module. Any suggestions?

I'm assuming that you're on a Mac, as this bug does not (to the best of our knowledge) occur on Windows.  Unfortunately, this is an Apple bug.  On the Mac, Lightroom uses Image Capture (Apple software that's installed as part of the Mac OS) to display thumbnails in the Import dialog.  Image Capture version 6.2 broke support for monochrome DNG previews.  We have reported the bug to Apple.  If and when they fix it, the problem in Lightroom should just go away.  But without eliminating reliance on Image Capture, fixing this issue is out of Adobe's hands.  (For any interested Adobe employees reading this, the Watson bug number is 3463549 and the Radar bug number is 13569454.)
Regarding the problem of aperture not showing up in Lightroom, my guess is that (at least for a given lens), the Leica Monochrom is not correctly writing that metadata into the file.  That's just a guess though.  If you'd like to provide me with a sample file, I can examine the file's internal metadata to see if the aperture value is missing, or if it's present and Lightroom is just not reading it correctly for some reason.  Probably the easiest way for you to send me a file is to upload it to Dropbox or YouSendIt or a similar service, and then post the link here.
Thanks,
Ben

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