Problems importing geometry - same static mesh in all actors

Hi all, I am having this issue: I just downloaded and installed the latest version of Datasmith Beta, and updated UE4 to the latest 4.18.2.

After exporting the model from Max using Datasmith everything seems fine.

But when importing to UE the wall mesh is used throughout all scene instead of the correct meshes.

It does import the materials, Textures, and meshes ( I can see them in the content browser) but the meshes are not applied to actors (apart from one that is used for every actor).

Am I missing some important step in the workflow? Any ideas of what can be the issue?

Thanks very much in advance,​​