Usually in each container or icon box there is a small double arrow that appears in the corners and sides of the box when I hover over it, which I can grab to drag the sides or corners of the box in order to make the box or icon bigger or smaller. When I’ve used balsamiq during the past couple days, those arrows have disappeared completely. I can still drag the sides of larger boxes when I point my mouse and drag, but it’s nearly impossible to do with the smaller boxes and icons.
I’m using a Macbook Air.
What can I do to get these double-arrows to re-appear?