Description of problem: When opening memory-consuming applications, the cursor turns indefinitely to its running aspect outside the window of the concerned application. The only way to get it back to the simple arrow is to interact with something outside the current window, for instance dragging it on the screen. How reproducible: Just open a heavy application (LibreOffice, settings or Evince). I'd have liked to include a screen capture, but never managed to take it with gnome-screenshots showing the bugging running cursor, even with the "show cursor" option turned on.
Feel free to contact me about this bug for more details if needed. Very annoying and easy to reproduce. ;)
*** This bug has been marked as a duplicate of bug 1692135 ***