AddThis buttons do not show on ordinary Plone pages

[andreabrugiolo]

In one of my Plone installations collective.addthis is working like a charm while on another one it shows pretty nothing but the "Share" text and the following '|' character.

In both my sites I am using collective.addthis version 1.3.3 on Plone 4.3.2 but
I seem I have to do with two different versions of collective.addthis. I tried removing the product (also the configuration from the registry) from the bad instance and reinstalling it but the behaviour is still different between the two instances: even the layout in the AddThis settings panels still differs a bit (not the values) as the bad one presents some fields in a grey box and the options order is different.

Note 1: in the "bad" instance the page presents a javascript script abine.stub.AddThis that is not present in the good one.

Note 2: all the addthis-related js/css resources seems to be available to the browser.

Note 3: even when I flag 'development mode' in portal_javascripts and portal_css all other icons are still visible.

Thank you very much for your attention