This thread is resolved. Here is a description of the problem and solution.
Problem:
The client was unable to disconnect translations from the default language page or post, even after following the steps provided in the WPML documentation.
Solution:
We acknowledged that this was a known issue which has been resolved in the latest version of WPML (v4.6.8). We recommended that the client should first take a backup of their site and then update WPML to the latest version to resolve the issue. The update can be done from the WordPress admin area by navigating to Plugins >> Add New page, clicking the Commercial tab, and then clicking the "Check for updates" button.
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