Images showing as blank on Multisite Sub-domain

We have two subdomains set up on a Multisite format. When I try to upload images into the Media Library, they appear to be loading, but then they only show up as a blank box in the library. I have tried to load on both of our subdomains ( and

Is there I a change I need to make somewhere in the settings for the images to load correctly. The images are only 512×512 and 38kb in size.