Equation Driven Curve does not rebuild

Hi!

I defined parameters a and b as global variables for an equation-driven curve. After creating an extrude feature, changing the values of a or b does not automatically rebuild the model.

I need the model to rebuild automatically because I am performing parametric sweeps in COMSOL. When COMSOL updates parameter b, the corresponding global variable in SolidWorks does change, but the geometry does not rebuild.

Is there any way to make SolidWorks rebuild automatically when global variables change?
Any help or suggestions would be appreciated.