Ubuntu 17.10: Can´t drag and drop files to dropbox folder

Using Nautilus I cannot drag files to dropbox. As soon as the cursor enters the area of the dropbox folder on the screen the image of the dragged file disappears and an empty "hand" icon remains. When I release the left button nothing happens. The "hand" icon persists and from then on I can not do anything within the Nautilus desktop, even if I shut the dropbox window. I have to restart the computer to get Nautilus to work again. This is a new bug in Ubuntu 17.10, in previous versions it worked correctly. I will report the bug to Ubuntu too.

Reproduce the drag-and-drop failure using Nautilus, the Dropbox folder, and Ubuntu 17.10, then compare the behavior with the previous Ubuntu version where it worked. Trace the Dropbox–Nautilus integration involved in the drop target and verify that files can be dropped without leaving Nautilus unresponsive.

Written by the indexing model from the issue text.