Problem with new fluid simulation tutorial

Hey, all–

I’m working through the v.2.4 fluid simulation tutorial #2 found:

http://mediawiki.blender.org/index.php/SoCFluidTutorial2

and I’m having a problem. When I set the glass as an obstacle and the liquid hits the glass, it’s splashing through the “inside” of the glass wireframe and not treating the glass as a solid until it hits the outside wall (from the inside). What am I doing wrong? I converted the glass from a subsurfed cube to a mesh and recalculated the normals, but beyond that I’m stymied.

Thanks!