Further comment: After terminating the commandline process, due to Ansys being non-responsive, the project is locked. So I can't even just run the same command again, if some length of time without a result has passed. I investigated this further by unlocking the project, then sending the command (manually), identically to the last automated command (same command, same data). Ansys ran successfully. This must be an instability in the way Ansys is run from commandline