Hi Yegor
If it got stuck, it is mostly something with the mesh, and I can say from my experience that if you use subdivisions, you can get mesh errors (non-manifolds, flipped etc.) so I HIGHLY recommend you to use DECIMATION MASTER before exporting mesh from ZB, as it can help you to get cleaner (topology errors) mesh.
If you can, send me the particular OBJ to milos.lukac@capturingreality.com so that I can inspect it.