I've spent some time reviewing threads on here regarding images not displaying, and their solutions either didn't work or didn't apply to my situation.
Up until approximately 5pm this past Friday (October 30th) the images on this particular blog were working fine, and then, after doing absolutely nothing any images contained within the wp-content/uploads folder do not show up. Images outside of this folder show up just fine, and in fact, we duplicated the uploads folder and renamed it to uploadx, and re-linked all of the images to that URL until we can solve this problem.
I've also called up my host and talked with a support tech, he didn't find anything wrong with the server, my htaccess file or file permissions.
If it matters, I have the wordpress files located in a /web folder, so the blog is accessed http://cmfmedia.org, but all of the wordpress files are in http://cmfmedia.org/web