I initiated a Save, making a New Folder, switched out of Illustrator to Chrome to get a job number to add to the folder name, switched back and was unable to type in the new folder window, or press the Cancel or Save buttons, or use keyboard! Clicking around I noticed I could select type in the input text field in a screen position that was NOT where the input field was. I moved the new folder modal to where I could select type and I was then able to press the buttons! I must have moved the modal either before switching out of Illustrator, or when coming back. But Illustrator only new where the modal was before moving it.