I think the new file upload progress widget is wonderful. I uploaded a lot of things today and only the things that were tiny had a problem. It's a timing issue where the upload is complete before that drag and drop window gets the message that the upload started. It stays on the screen for infinity time looking like it's in progress. Clicking cancel or the window close "X" gets rid of the orphaned window without trouble. Functionally everything works. Just the timing of tiny uploads needs a tweak.
:10000/filemin -> Upload to current directory, hangs if upload is fast.