Google SERP not showing my metatags OR auto-generated ones

I manage a multilingual e-commerce Drupal website which is now included in Google’s index, but Google SERPs show URL and page title but no text at all where the meta description (or auto-generated alternative) should be shown.

You can see what I mean here:

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  • Metatag descriptions of the recommended length are present on every page, carefully-crafted: useful, relevant and unique (non-pasted) text
  • Metatags or auto-generated alternatives are shown as expected in all the other search engines I’ve looked at (Yahoo, AOL, Bing, Duckduckgo) and indeed are visible to online tools "meta tag checker" type tools like this and this