python drivers don't work anymore after reloading file I am using python drivers to set the position of a number of bones, using a script to register custom functions in the driver namespace, so that I can reference them in the expressions (bpy.app.driver_namespace['calcPosition'] = calcPosition).
that works fine, but as soon as I reload the file, it does not work anymore. yes, I made sure to reload trusted, and I re-ran the script (do I have to do that?), but it simply won't work until I re-enter each and every expression and hit enter.

is this expected behavior?

is there a way to make things just work, right after opening a file?
you need to make sure that the Register checkbox is checked to avoid pressing Run Script every time you want your driver to execute.



and as mentioned in the checkbox tool tip, your script name should end with ".py"