As you can see I'm a complete novice!! I've lost my cursor it has disappeared from the workspace area, but you can see it if you move the mouse around on the outside of the space! At the time I was using brushes. I've reset the brushes, but nothing works, any help appreciated.
What is the size of the brush you are using? When using a brush, your cursor turns into the shape of the brush, so if your brush size is larger than the canvas size, then you won't be able to see it.
I've had this happen to me a number of times when I knowingly had the CAPS LOCK on. If you turn it off, you should regain the proper cursor