This thread is resolved. Here is a description of the problem and solution.
Problem: What I'm trying to do is display the 3 most recent articles as previews in a page. The problem is that on the French (main language) side, everything work fine. However, on the english version, the thumbnails images are not shown. Solution: Go to Dashboard → WPML → Settings → Media Translation (make sure that you installed the WPML Media Translation plugin), and press the Start button.
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