Fade to black

Today switched the mouse cursor from the stock Ubuntu white to black.
That isn't news at all -well, for it is...- except for the fact that there is a bug that doesn't allow you to change it (if you're running Compiz).

You don't only need to edit the file:

/usr/share/icons/default/index.theme

With the name of the cursor shape you want to use, but also be sure that the same name is reflected on the "index.theme" file of the actual theme you are running.