I rebuilt our laptop, and the read-only script for read-only connection verification on Fairino FR5 now rejects an argument before contacting the controller. The old laptop still runs the same script. I've found several SDK folders, but no record of which copy it uses.
Our setup is in a bench cell awaiting software commissioning, with a fixture plate as the reference item.
@JasperBarnes0551 Different paths. Our vendor folder on the old laptop, an installed package on the rebuild. I'd compared everything except the imports, apparently.