Thumbnails not visible

  • Hi there,

    unfortunately for quite a while my slide decks don’t retreive the thumbnails of youtube or vimeo videos anymore, when I add a new slide.

    The videos are playing well, but there is just a black field instead of a thumbnail in the slide deck and a black field with the slide number instead of a thumbnail in the preview.

    You can check this out in the slide deck down on the right on my site:
    https://annisultany.de/sprecherin/demo/
    The second slide is a new slide and shows the problem.

    For this reason I wasn’t able to add any new slide for a while now.

    If anybody can help to solve that issue, this would be amazing!

    Thanks a lot!

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

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