Problem importing

I know how to import into A3 and have imported thousands of pics, but...

I'm trying to import 2 images from my photos external disk, and they don't show up in the import window. I have tripled checked how I'm navigating to the disk to get those pics, but they won't show. I have UN checked "Do Not Import Duplicates." Still no show. I know the images are there for import because I'm looking right at them in the Finder as I try to import them. Anyone know what's going on?