I had to roll back again from 1.4 to 1.2.1 as the plugin added a whole bunch of text on the home page stating “product x could not be added to the cart as it’s out of stock”, “product y could not be added to the cart as it’s out of stock”, “product z could not be added to the cart as it’s out of stock etc.
Rolling back to 1.2.1 sorted it out again.