No themes loading on the “Add Themes” page

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Hi people,

I have just set up a new site. Using the latest version tar. Everything is working fine, except for one thing: whenever I click the “Add New Theme” button (which goes to /wp-admin/theme-install.php?browse=popular), no themes are displayed whatsoever: I only see the animated circle as if it were loading. Searching or selecting another tab does not help either.

I did basis troubleshooting as suggested here and also disabled UFW, checked curl, doublechecked directory/file permissions. Debugging does not return anything either.

I am at a loss. Has anyone seen this before and/or has an idea where I should look for a solution?

Thanks!

The page I need help with: [log in to see the link]

 

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