Rightly or wrongly, my workflow is to create a folder and download my images to that folder on my C drive. I then import into LR from that folder. In the past, when I've added new images to that folder and went to import, I would check "import new" and only the new images would import. Now, when I tried to import new images added to a folder, I see the "loading" into LR but then as soon as the last image is seen, the thumbnail panel goes blank and the import button is greyed out. I have reset preferences to no avail.