Hi all, I'm running some code on Chimera to select only certain chains and nearby aspects, but when I try to delete the extraneous information, Chimera freezes up. I'll detail the commands I use below, and for reference I'm interested in the H chain of 1CT1, but it doesn't seem to work with any of its chains. open 1CT1 zonesel :.h 3.5 extend true select invert del sel It then freezes on del sel. I've tried this with other pdb files and it works fine, but for some reason it stops on this one. For example, it works fine on 1PZ3 for its A and B chains. Is this some kind of bug or is there a work-around to this issue? We looked at the residues and couldn't find anything out of place, so we are not sure what is happening. Much thanks in advance. Best, Korbin West? Wabash College