Restart your PC and see if the problem is resolved.
If the problem persists after you restart your PC, try the following steps.
If the problem persists after you have tried the above steps, please let us know using the contact form, including the model number of your tablet, the version of the driver you have installed, and a description of the problem you are experiencing.
Update your tablet driver to the latest version and see if this solves the problem.
If the problem persists after you update the driver, open the Brush Environment Settings window from the File menu. Then try the following steps to see if the problem is resolved.
Some tablets may work correctly if you check the “Validate native OS pen pressure detection” checkbox in the Pen Pressure Detection with the driver uninstalled.
Non-Wacom tablets are not currently supported as we have not yet prepared the environment for verification. So please note that if the problem persists after you’ve tried all of the above, we have no further guidance to offer.