I've just answered my own question....

The answer is in the bugs forum.

I'm such a numptie. Feel free to delete this thread!

Hi, I'm having problems with tutorial 1.3; "Now the highlighting looks correct, so press the spacebar to activate this fill. We'll just stick with the default fill color of white and outline color of black, so there's no need to modify the colors. However, we will add a line effect to make the ...