I think I know what the problem is. You can produce solids in VC, but in VM, in order to produce cutter paths, there is one additional step. VM needs edges for you to define cutter paths to. Select the Curves tab, and then the All Flat Areas, or Flat areas option. Click on the solid, and it will find edges for you. The edges are what you can select. If you are drawing in 2D, there is no need to do this. One other common option after this is to define the starting point. Select the path, then under the Modify tab, you will find the Change Start Point option.