The probe model in my MR project comes from a Shelxl refinement, and the .pdb file does not contain atom types at the end of each ATOM statement as modern .pdb files do. I have magnesium atoms in my model and the atom names for these atoms are "MG" and are properly shifted one space to the left of place where atoms with single letter element symbols lie. Phaser has no problem with this .pdb file. Resolve, however, considers this to be a fatal error. Opening MR.1.pdb and reading coordinates Warning...unknown atom type "M " ...this may indicate characters in columns 77-78 of this PDB file that are not the element ID. This and all similar labels ignored Failed to read line in PDB entry The PDB line is: ATOM 2953 MG BCL B 1 26.429 2.746 -11.155 1.00 12.03 Sorry could not read model file MR.1.pdb Seems a little harsh to me. Especially since the error message doesn't make it back to the log file monitored by the Wizard. I was confused about what was causing the wizard to stop until I dug into the other files in the AutoBuild directory. Earlier in the log file the program worries about my atoms "NA" and "NB" but does conclude that they are nitrogen atoms. In the future I'll work with .pdb files with the extra atom types at the end of the line. Dale Tronrud