James,
Thanks for the reply. It’s useful to know that just doing Edit, Save should flush the cache.
After much frustration doing this, restarting the Allen Bradley drivers module and eventually restarting Ignition, the problem still seemed to remain. It was only then, upon looking in the PLC we saw a bug had been introduced when the program was reloaded - and what Ignition had been reading was in fact correct.
It’s still a bit worrying that reloading the PLC program caused issues to start with (aside from the non-issue above). The Allen Bradley drivers are 1.6.6 (b2014040112).