oh my god (!) … no, no, it has nothing to do with the MAC … there is a principle bug inside: I cannot load any PDB file correctly with version 3.4 (I just compiled Blender)! The same applies with the patch of course … . I need to see what has happened … . 
So, for you, please, downgrade Blender and use 3.2.0. There, everything still works … .