Hello, When trying to calculate hydrogen bonding between two molecules, I get the error: "ValueError: More than 2 coplanar positions specified!" I have successfully calculated h-bonding between two other similar molecules, so I'm not sure what the problem is (I have no alternate conformations or anything weird in the PDB files I don't think... is there anything that usually triggers this error?) thanks! mike ___________________ Michael Gretes PhD Candidate (Structural Biology) Senior Graduate Trainee, Michael Smith Foundation for Health Research NCJ Strynadka Laboratory Dept. of Biochemistry, University of British Columbia Life Sciences Center, 2350 Health Sciences Mall Vancouver, BC Canada V6T 1Z3 phone 604 822 7729 fax 604 822 5227 ____________________