The files I upload to my media library are suddenly displaying as a broken image. The files that are already in there are fine. But for the last few days when I upload a file (jpg, gif, png, doesn't matter which), the upload seems to be successful but the image doesn't display (there's just a broken image graphic). If I select edit, the file actually does display in the edit mode. It does not display anywhere else. The file is actually being uploaded to my server, but the image cannot be displayed in the media library, or if I add it to a page. I can add images from the media library to pages that I uploaded before this happened. I have other WordPress sites and they're not having this problem.
Any help would be very much appreciated. Thanks.