All files on exchange are corrupt (this problem has been fixed)

I can't imagine why it is doing that?! I notice that copies of houses I dl'ed previously show as fine, now they don't, and they don't dl with the proper file name (for example the house name, just a number). It also looks to me like those are the pictures that are coming up as corrupt. I don't know, strange. I wouldn't remove anything as it doesn't have to do with the upload itself.