Thanks Jon!... I can confirm that it indeed is working properly now with caching turned off.
While the issue on the plugin's end is solved, we now face the next problem, WPEngine, our hosting provide, has a caching mechanism that is always turned on... this may mean we'll need to find another hosting or find a way to turn it off on our installation.
But again, no longer a problem for this plugin. Feel free to close this thread Jon. Thanks so much!