Could you please let me know the exact version of Lightroom installed on your computer?
Also, what is the make and model of the camera that you use?
Try copying the images from the card to a folder on your desktop once and then try to import and check if you are able to view the thumbnails or not?
I just figured it out. When I'm importing my Sd card shows up in the sidebar on the top (as usual) where it doesn't read. Then on the bottom it shows up again and those files I am able to read. Not sure why that is.
I have an X-Pro2. And Lightroom is 6.6.
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Make sure you have a destination selected. Often when there is no set destination, the thumbnails don't appear - but as soon as you click in the Destination panel, the thumbnails show up. This has been a bug since version 3 or 4.