Troubleshooting
Some common problems people may run into when using drivers.
Scripted Expression
By default Blender will restrict execution of Python scripts.
If using a Scripted Expression Driver Type that doesn’t follow the Simple Expressions subset, you will have to open the file as Trusted Source, or set Auto Run Python Scripts in Preferences ‣ Save & Load ‣ Blender Files.
Rotational Properties are Radians
Parts of the User Interface may use different units of measurements for angles, rotation. In the Graph Editor, while working with Drivers, all angles are Radians.