In WordPress, if the images are uploaded in the correct location and your code references each image correctly, you have HotLink Protection enabled. You need to add your domain/subdomain to the, URLs to Allow Access, list found within HotLink Protection. You should specify both with and without the www's if you want the images to display from both URLs.
Please view the kb article "How do I setup Hotlink Protection?" for more detailed information about Hotlink Protection.
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