Pydrivers not working in fluid simulations

This may not be the best forum for this, so please move if needed.

I cannot get the pydrivers to work properly in fluid simulations, specifically sine and cosine functions to animate the xyz gravity settings (it won’t recognize sine function at all). I’m fairly confident this is a bug since I can paste the pydriver experssion into regular objects and control rotation, displacement, etc. I’m also hoping someone can verify this bug before I submit it. If you have questions I can post my blend file.

BTW, anyone know how to show the pydriver animated IPO in the IPO window? This would be useful when debugging these types of problems.