Where's the Voxel?

Working with Andrew Price’s smoke tut and, just like some others have experienced, I cannot see voxels in the texture window. I can see other textures, just no voxels. This has happened in the Blender 2.4 v3 Beta version, on both Mac and Windows platforms. So just where the heck are those rascally little voxels anyway?

It doesn’t always work.
As long as it renders, though, what’s the problem?

Spacetug, the problem is that the only thing that renders are halos, the voxel textures don’t show in the render either.