Hi Michael,
Thanks very much for your reply.
Unfortunately that doesn't work for me (the "Show mouse" checkbox was already unticked and I've tried the code solution, too).
I think the problem is to do with the touch screen environment: When I start the experiment the mouse is not visible, but as soon as I make a touch screen response the mouse pops up where I touched the screen, and stays there until I make a different response (then the mouse moves to the new location).
I wondered whether I should specify (when using the code) which screen I am referring to, so I have tried putting "Screen = 2" above your suggested "win.setMouseVisible(False)". But again no luck!
Perhaps I am putting the code in the wrong location in the experiment? Though I've tried quite a few different places!
Thanks for your help anyway!
Maria