I import photos, but only gray boxes show in lightroom. about 5% of the photos to load, but the rest are just gray. I can't delete the "images" from lightroom. If i look in finder, I can see the .CR2 files in their folder, I just can't access them in Lightroom. The work around is import them a 2nd time, but name the folder something different. For my work flow, i usually have a subfolder called "raw" within the client folder. It no longer imports to any folder titled raw, it has to be some different word for it to work. SUPER disruptive since I upload to 5 or 6 clients a day.