I'm new to Blender and unsure if this a bug in the beta version or my error. I can't make the union boolean modifier work. It does nothing visible.
Setup: I created an svg file and imported it. I then converted the curve to a mesh. Since it has several discontinuous parts I selected the linked parts of the mesh and filled them. Then I extruded the mesh to get depth. I intend to 3d print the result so the separate parts needed to be joined. I created a cube and scaled it to use as a connector. I duplicated the result and moved them into place. I selected the shape and added a 'union' boolean modifier. The first cube worked. The other cubes do not work. Picture attached.
What I checked: I believe the meshes are closed, water tight, and the normals face outward. Any other suggestions?