I cant draw a straight line, both with pen and pencil tool, let alone circles and more complex shapes. My lines are perfect on Toon Boom Harmony and, and since its a software from the same company I figured out the problem isn`t on my drawing tablet (Genius Easypen i405).
Please contact support@toonboom.com by providing the version of Storyboard Pro, OS and hardware spec such as CPU, RAM and video card.