Site visitor Mark sent an email earlier this week to alert us to a peculiar issue where Adobe Lightroom 6 displays and imports duplicate images when using a USB cable to import photos from the Canon EOS-1D X Mark II when two memory cards are installed in the camera with only one of them having RAW images recorded on it. One of the earliest references to the issue appears on the Adobe Photoshop Lightroom forums
in a post made more than a year ago.
Unfortunately, according to Mark, the issue isn't limited to Lightroom 6; it apparently occurs with Apple Aperture 3.6 as well. That the issue appears on multiple software platforms may indicate that a firmware update from Canon will be necessary to correct the issue.
Has anyone else run into this duplicate file issue when importing RAW files with the Canon EOS-1D X Mark II? If so, besides taking one of the memory cards out of the camera, did you find a convenient workaround? Let us know in the comments below.