Mouse Cursor goes missing (Mac pro)

Hiya All.
I have a Mac Pro.
My mouse worked fine for months.
However I noticed after I installed the second last big software update (may well be a coincidence) the mouse cursor just sometimes disappears when im using the mouse, it annoys me so.
It like mostly goes into one of the corners like off screen sometimes. I have to lift the mouse and place it again to get it back.
I have changed the mouse keyboard and usb ports and reinstalled Mac OSX, (I installed all the updates) it still does it.
It annoys me that much im thinking of selling it!!

Can anyone help me with this?

My mouse will do what you describe if I run it off the pad (into thin air) by accident. With my setup, that can happen if I'm not being careful about it. These optical mice need a proper surface to operate on. Could that be something effecting your mouse?

well im going to try another mouse pad, see how that goes