Can't influence width by applying pressure on Bamboo pen

I just started using Toon Boom Storyboard Pro on my PC. Unfortunately I can’t change the width of the line by applying different pressures on my pen, though it works with other programs. Could anyone help? Thanks!

First thing - what graphics card do you have on your computer? Do you have the latest graphics drivers installed for your computer? What OS are you running?

Make sure that you delete the Wacom tablet preferences file - this usually solves this kind of a program. After you delete the preferences restart the application.

If you’re still experiencing problems, if you’re on Windows 7 or Vista, try to disable the Aero theme on your desktop. Right-click on the desktop, then under themes choose Basic instead.