I have opened my post and re-saved it with a th...

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I have opened my post and re-saved it with a thumbnail, and it is still not showing up.

Your web host is not letting the TimThumb script create a folder with the correct permissions due to their security policies (Host Gator is one example). Contact your webhost and tell them you are trying to use the TimThumb script in your Wordpress installation and they should be able to help you with the permissions.

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