What are your import options on the top and right panes of the import dialog?
That's a good question. I kept the right side in "solo" mode, meaning one panel only is open at a time. I didn't change anything (other than the destination) since my last import on 8/16/15...when everything about the import then went without any problem.
However, in order to view all the panels on that side, after posting the issue here, I unchecked "solo mode". All panels opened and NOW, the Lightroom Import dialog sees ALL images in any folder and I can again import.
I contacted Adobe support since posting here. I was told that this is a known bug in Lightroom (I was the second "customer" who reported this today). She claims it has something to do with file permissions. If one file permission setting is misread by LR (the bug), then Lightroom can't see ANY image files.
I still don't understand what I did...other than to uncheck "Solo mode"...that allowed LR Import to again operate properly.
What, specifically, were you thinking when you asked me about the import options in the right panel? What setting were you wondering about that could have explained my experience?
Thank you for your timely response.
I was going to check on copy vs add, destination folder names, and folder permissions.
The original problem was present whether the option was Copy as DNG, Copy, Move, Add. I don't see where folder permissions is listed in the destination (right side) or the import dialog. Where were you going to look for permissions within lightroom?
The folder permissions are viewed outside of LR in File Explorer.