This thread is resolved. Here is a description of the problem and solution.
Problem:
The client is unable to view content in the WPML >> String Translation page, which appears empty. Additionally, when editing a page in both languages, changes made in the default language do not save correctly, causing the translated page to revert to the original.
Solution:
First, ensure you have a backup of your site. Then, follow the workaround provided in the WPML errata page to address missing database tables related to string translations. You can find the necessary steps here: Missing _icl_strings and _icl_string_translations Data Tables.
If the issue persists or if the solution provided here becomes outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should you need further assistance, please do not hesitate to open a new support ticket at WPML Support Forum.
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This ticket is now closed. If you're a WPML client and need related help, please open a new support ticket.