I am stumped. All of a sudden, when I upload an image file to the file manager, it just hangs and I have to hit reload to see the image appear in the file manager. It seems like its getting stuck on creating the thumbnail of the image since it just uses the generic icon for image rather than the actual thumbnail.

I've seen another topic on this, but I doesn't seem to apply to my situation - I am running a dozen sites off the same concrete5 core, on the same server, same configuration for ever site, yet every other site uploads images just fine, thumbnail and all. Could it be something found in the site specific database or something?