Thanks for the response. I ended up creating another import folder and redirected Evernote to pull from the new folder. Now everything is working fine again. Strange - don't know what caused the first folder to get stuck but it is resolved now with the new folder.
I am using a new Windows 10 computer and created an import folder where Evernote can automatically import and delete files in that folder. It was working fine for the first few imports. Now Evernote completely freezes (not responding) whenever there is a file in the import folder. How can this be resolved?