Point heat source in axial symmetry at origin

Hi all,

I want to model a simple point heat source at the interface of 2 materials. I can make finite cylindrical slabs of material in 3D with the point source in the middle but it would be much more efficient to move to an axial symmetric model with a point heat source at the origin. Unfortunately, whenever I try to place a point heat source at the origin of the axial symmetry but no heat is dissipated in the model and the entire model stays at room temperature. Is there an easy way around this? Or is this fixed in a newer version of COMSOL (I have version 4b)?

Thanks,

Erik