Hi, this is my first time using ChimeraX-1.10.1 and I ran into a little bit of trouble with syntax errors in this version.\ I opened a pdb file that contains two chains of proteins that I'm interested in - Chain A and B. I then renamed and coloured them to Chain C and D for clarity. In the Contacts window, I made the following changes: Find pairs of atoms with: ✅ VDW overlap ≥ –0.4 Å Limit by selection: ✅ with at least one end selected Ignore interactions between atoms 4 or fewer bonds apart: ✅ Ignore interactions between residues <5 apart: ✅ Include intermodel: ✅ Include intramodel: ❌ (uncheck it) Include intramolecule: ❌ (uncheck it) Ignore hidden models: ✅ Display as pseudobonds: ✅ (keep green, radius 0.075, dashes 6) Write info to: Log ✅ Then click Apply I then selected the atomic model #1 (Chain C+D) and deselected surface models #1.1 (Chain C) and #1.2 (Chain D) and ran the Contacts Command: "contacts atoms #1/C #1/D makePseudobonds true distanceCutoff 4.0 log true" but the software returns "Expected a keyword" argument and highlighted "distanceCutoff 4.0 log true" in red. Alternatively, I also tried "findclash #1/C test #1/D overlapCutoff -0.4 hbondAllowance 0 interModel true intraMol false intraRes false makePseudobonds true select true log true" but again it fails to output contact coordinates between the two chains and returns the following: "Unknown command: findclash #1/C test #1/D overlapCutoff -0.4 hbondAllowance 0 interModel true intraMol false intraRes false makePseudobonds true select true log true". I would appreciate your help in resolving this error for me. Thanks, Vivian