That's odd, have you tried clearing your cache & cookies with these steps: https://goo.gl/FdWwvE ? Let us know if that helps.
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Thank you for your quick response.Will definitely give that a try from my side, i am concerned about the user experience( my subscribers and the audience) because they might not see the custom thumbnails. They might not have a clue to clear the cached files on their browsers.
End of conversation
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