After adding Language Switcher module it is not visible in Web Presence Builder editor:
Module was added to site in Web Presence Builder editor.
After site was opened in editor again, module Language Switcher is not visible.
Even if it is visible it can not be removed and not all selected languages are displayed.
Caused by software issue with id PPB-4384 . It was fixed in Web Presence Builder 12.0.7.
Issue was fixed in Plesk 12 MU#29: Plesk 12 Release Notes .
Install latest Plesk microupdates.
WPB Standalone & WPB for OSA:
Upgrade Web Presence Builder to the latest version.
Note: Only for WPB 12.0.6 in OSA
Backup files on Web Presence Builder centralized instance
<wpb installation path>/htdocs/js/minimized/Editor.js
<wpb installation path>/htdocs/js/Sb/widget/Language.js
Replace them with the patched ones .
Note: Web Presence Builder installation path looks like: