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If you’re having trouble with images not displaying on blog pages or in shortcodes / page builder modules such as carousels then the issue may be caused by a featured image not being set for your post or page.
For example if you are using the post carousel and have not assigned a featured image to your post then you may find that either your posts are not showing in the carousel or instead that the posts are showing however with the grey placeholder image.
To correct these issues please ensure a featured image is assigned. The following screenshot shows where you can find the setting to assign a featured image to your post: