Noticed a new problem in LR6 - when converting NEF files to DNG after importing the original filenames are replaced with 'unknown' plus an index number e.g. _DSC163.NEF becomes 'unknown 01.DNG'. This never happened in LR5, the original names were retained.
Am I missing something new in LR6 or is this a bug? I want to retain original filenames.
iMac late 2012 and latest Yosemite.
Yes, I'd checked that; the box is un-ticked. As I said, never encountered this before and been using LR since its introduction. Quite mystified.
Try resetting the preference file. With Lr6 this means using holding down Alt+Shift modifier keys when launching Lr