This topic has been marked resolved throughout but "Use the Hotfix plugin/code" is not my bag.
Images are broken within the WP Media Gallery. All other data seems to be working fine. I can only see an uploaded image when i go to "edit" an image within the Media Gallery image editor, other than that it is only broken file placeholders.
Fresh WordPress 3.5.1 from the admin panel
All plug-ins deactivated
Files upload fine, just can't see them
File permissions right now on all folders and files:: 775
Default Twenty Twelve theme
Only 1 child site in my network
Media Gallery seems to work fine in the main site, just not the child site.
Thanks everyone, any help or advice is really appreciated.