Recently updated to CC 2015.2.1
HDR and Pano merge, which were working before the update, both result in a totally black preview screen and merged image...
Anyone else seen this? Is there a fix?
Try updating the graphics card drivers from the manufacturers website and if that does not work roll back to previous version - Roll back to a prior update version
This is a known bug in 2015.2.1. For a previous thread see here: View the full discussion . Only fix is to revert to 2015.1.1.
Also see: Lightroom 2015.2.x pano function not working for DNG files from a Leica M8.2
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