I have the exact same problem, however I am importing from the memory card directly after inserting into my brand new Dell XPS 15 with updated drivers. It finds the photos and then stops before I can import and freezes. I guess it is looking to see if the pictures exist. I have never had issues with this working on Windows 10 until today. I have had windows 10 since 2013 on another laptop and never had issues either.
One thing to mention is that I just recently added a few folders manually to the photo directory by copying them in explorer. Could this have caused an issue?