Featured Images don't show after migration

Hi, I’ve recently moved a site from one domain to another and done the usual find and change in the database from old to new domains.
Everything works well apart from the featured images on my posts.
The box shows up but the actual image is missing.

I’ve tried uploading a new image to the media folder, adding it on the dashboard and it show up bottom right as featured image, then when I view it, it’s missing! The alt descriptions show but no image.

Any ideas???