Yes, this is a problem. I made my own set of curves in SpaceClaim, assigned a rectangular beam cross-section and got this mess.

Looking at the documentation, it seems the ability to control beam orientation is superior in DesignModeler.

However, importing the SpaceClaim file into DesignModeler did not make it simple to edit the orientation.

I will have to start over in DesignModeler and import the curves, then create Line Bodies and see if I can succeed.