Saving is working for me, so I think the problem might be on your end? Has anyone else had issues with this?
Also, the info page about the plug-in says this:
Uses browser localStorage to store/restore generated between browser sessions on the same computer/device. Older browsers, some mobile browsers etc do not support localStorage.
If a browser doesn’t support localStorage the system shouldn’t stop your game from working, it’ll only inform the player they can’t save - not actually “crash” - let me know if it does.
I wonder if this is the problem?