The Multiply Sources component works slightly differently than in the Main Application (in fact, there is no Multiply Sources in the stand alone app). Basically, the multiply sources does just that... It takes any information generated by the source objects (like an orthogonal cylinder) and multiplies it with the underlying voxel data structure. I'm assuming you're using the base voxel configuration which constructs the layout using the Shape and Material Ratio channels... but more importantly the default value for the fill is set to 0.0. Thus, when you multiply the sources with the fill value of 0.0... all you get is 0.0 in return which mean you get no resulting geometry. Try changing the Fill value in the Construct Base Voxel values to 1.0 and see if this fixes the problem.