Ubuntu – The mouse pointer in the Ubuntu VM has turned into a little hand with a document, and clicks are ignored. How to get out of this mode

The mouse pointer in my Ubuntu 8.04.3 LTS VM (running in VMware Fusion) has changed into a little hand holding a document. It doesn't show up in screen-shots.

All mouse clicks (left or right) are ignored. But I can still type in the one Terminal window I have open. (And commands work fine.)

I wonder if I'm in some kind of drag-and-drop mode.

How do I get out of this?

Update: Rebooting (from the command-line) worked. Ubuntu came up with the regular mouse-pointer.