Site groups not selecting when submitting content for copying

Hi,

I recently updated to version 1.2 and the 'Site Groups' dropdown menu has stopped working on the post page section.

I am able to select the individual site groups from the dropdown but on clicking 'Copy' it gives me a pop-up saying 'You must select a group'.

This was working find on the previous version and there have be no other updates or amends to any Wordpress or plugins except this one.

Kind regards,
Robert