Some of the devices that run Windows 8 and above have the default scaling set to a value other than 100%. Flash may crash while trying to use the brush tool with such settings.
Steps to reproduce the issue:
- Open a new Flash document.
- Select the Brush tool and start drawing.
The text scaling on the device may not have been set to 100%. Set the text scaling to 100% in Start > Control Panel > Display as follows and restart Flash.