Images not showing up

I recently set up multisite on an existing WP blog and have been adding new blogs to the network. I’m using the domain mapping plugin to give those blogs their own domain.

The domain mapping is working correctly and I can view the new blogs and their posts on the mapped domain name, but images won’t show up anymore. I checked the URL of the images and they match the URL of the new blogs. When I try to upload a new image the image IS being uploaded to the server but it’s still not showing up.

The image uploader sets the image URL as “https://MyMappedDomain.com/files” whereas the image is actually uploaded to “https://MyMainDomain.com/wp-content/blogs.dir/2/files”

Does anyone know what I’m doing wrong?