Is it still possible to add symmetry restraints to automodel in
spectial_restraints? I used to be able to do this with pick_atoms, but
now that "selection" has taken over I seem to be missing something.
It has nothing to do with selections, but rather that Modeller labels
the chains A, B, C, etc. when you have multiple chains. Try a search of
the mailing list for "no such residue" for some examples.