Hi Folks, I think I am missing something obvious and am hoping that you can quickly tell me my mistake, so let me begin my story: I downloaded xraylarch-2021-060Linux-x86_64.sh into downloads on a Asus Zenbook using ubuntu 20.04.2 LTS I ran the command bash ./xraylarch-2021-060Linux-x86_64.sh Larch appears to have been correctly installed, but because I am using a gnome desktop no shortcuts appeared on my desktop (as promised) ,and there were no files that I could identify as shortcuts in my Downloads directory (which was set to display hidden files) I then moved to the /xraylarch/bin and tried to launch larch using python and this is what happened: python larch Traceback (most recent call last): File "larch", line 5, in <module> from larch.apps import run_larch File "/home/donb/xraylarch/lib/python3.8/site-packages/larch/__init__.py", line 52, in <module> from . import builtins File "/home/donb/xraylarch/lib/python3.8/site-packages/larch/builtins.py", line 27, in <module> from . import xrd File "/home/donb/xraylarch/lib/python3.8/site-packages/larch/xrd/__init__.py", line 25, in <module> from .amscifdb import CifStructure, get_amscifdb, get_cif, find_cifs File "/home/donb/xraylarch/lib/python3.8/site-packages/larch/xrd/amscifdb.py", line 40, in <module> from pymatgen.io.cif import CifParser File "/home/donb/xraylarch/lib/python3.8/site-packages/pymatgen/io/cif.py", line 25, in <module> from pymatgen.core.composition import Composition File "/home/donb/xraylarch/lib/python3.8/site-packages/pymatgen/core/__init__.py", line 21, in <module> from .lattice import Lattice # noqa File "/home/donb/xraylarch/lib/python3.8/site-packages/pymatgen/core/lattice.py", line 23, in <module> from pymatgen.util.coord import pbc_shortest_vectors File "/home/donb/xraylarch/lib/python3.8/site-packages/pymatgen/util/coord.py", line 17, in <module> from . import coord_cython as cuc File "pymatgen/util/coord_cython.pyx", line 1, in init pymatgen.util.coord_cython ValueError: numpy.ndarray size changed, may indicate binary incompatibility. Expected 88 from C header, got 80 from PyObject I also tried to use python to start larch_server and xas_viewer and had the same results. I also have the same results if I try to launch larch using ./larch This is the information on the version of Python that I am running: Python 3.8.10 (default, Jun 4 2021, 15:09:15) [GCC 7.5.0] :: Anaconda, Inc. on linux Type "help", "copyright", "credits" or "license" for more information. Any suggestions anyone has to offer will be appreciated. Wishing you all the best, Don -- Melting rocks today for a better tomorrow . . . Don R. Baker, Professor of Geochemistry, McGill University