I just had this same problem today.
Go into your 3D view, or cut a section where you know you have a beam (but it's not showing up) and select the beam and view the element properties. In the element properties for the beam, go to the bottom into Beam Properties/analytical model/ and vertical projection. This was set to the wrong level. I had to go and select all of my beams and either set it to 'auto-detect' or the level that you want your beam(s) to show up on.