The installation of the new version will have generated a new plug-in key, therefore the Facebook app will need updating with that new key for it to start working.
Also if you have previously manually edited the /admin/includes/languages/english.php language file to add:
Code:
define('BOX_CONFIGURATION_ECOMMERCEBROWSER', 'Facebook eCommerce Browser');
This can now be removed, as it is now created by the extra_datafiles in the admin/includes folder on the new version of the plug-in zip file.
If that doesn't work please can you create a support ticket, with Shop and Facebook URL and Version on ZenCart, so we can help resolve the issue. http://support.ecommercebrowser.com/
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