Hey Fred, big thanks for reaching out & for all the detailed feedback, very much appreciated!
But we are left with two options:
1.) go to one of your posts, right-click anywhere, click on the 'Inspect Element', open up your browsers 'Console' and then click on that orange 'Edit Related Posts' button. After you have done that, take a screenshot of your console and send it back to us.
2.) Your credentials. We can completely understand if you're not comfortable with sharing this with us, but I'm afraid this might be the only viable solution for us right now, since we cannot access that JS error in any other way. It also goes without saying that your privacy is to our upmost concern, after which we will take all the extra precaution possible.
Also — rest assured that none of your settings will be changed or modified, nor will anything be edited or published. All we want is to collect some data.
Let us know what you think and we'll do our best to help you out! I'm looking forward to your reply!
Take care & have a nice day!