This process used to work fine until permissions on all my files were changed, which I think is preventing the creation of thumbnails. Everything else appears to be working fine, except thumbnail creation. I'm using coolness templates, CB and CB Subs. Could anybody tell me which files in the administrative section actually execute the code to create the thumbnails? I need to identify this file so that I can change the permissions of the file to allow the execution of the code (if file permissions is indeed my problem).

Thanks for any help. I don't just want to change back the permissions on all files - just this one.