Hi – sorry you’re hitting difficulties 🙁
The first thing to do here is figure out if there might be a conflict of some kind. I see you already ran through our standard troubleshooting steps which is fantastic:
YES, I’ve deactivated all other plugins to check for a plugin conflict.
YES, I’ve reverted to the 2011 default WordPress theme (with other plugins still deactivated) to check for a theme conflict.
Did this allow you to isolate any conflicts, perhaps with another plugin or else your theme (or some custom templates within your theme, perhaps)?