Keynote - presenter notes blacked out

Hi there,

I'm not sure what i am doing wrong here as i am definitely a Mac novice - i'm trying to create a presentation on keynote with presenter notes. Why is my text box for presenter notes black and the font black so i can't actually see what i'm typing. Even highlighting the text to white isn't working - i can't see where to change so the text box isn't black!

Pictured below: what am i missing here?!