Hello. I am a new user of PSI4. I have used Gamess in the past. I got everything up and running and I have been impressed with the speed relative to Gamess. I have run into a problem. When running a geometry optimization (DFT) for a larger molecule, (~150 atoms) the calculation drops to a single thread with the threading system variable set for 60. A smaller molecule calculation (same input script) is properly using the available threads. My system has over 350 GB of RAM so memory should not be an issue. Has anyone had this issue?