This thread is resolved. Here is a description of the problem and solution.
Problem:
You are unable to add a comment to an existing support ticket related to a WCFM vendor frontend issue on a site under development.
Solution:
We recommend that you first try logging out and then logging back into your account. Additionally, clear your browser cache to remove any stored data that might be causing the issue. If the problem persists, we suggest trying to access the ticket using a different browser. This approach often resolves issues related to session or cache conflicts.
If these steps do not resolve your issue, it might be due to reasons that are no longer relevant or applicable to your current situation. 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. If the problem still exists, please do not hesitate to open a new support ticket at WPML support forum.
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