The chmod tool does not work, whats wrong?
The chmod tool can only change the filesystem permissions of files and folders that are owned by the webserver. Probably, some or all of your files / folders are owned by your account. If you don’t use the Pre-Installer anyway, just forget about the chmod tool. Probably you don’t need it. If you are a Pre-Installer user and need it to work, ask your webhost to run ‘chown -R www /path/to/your/gallery/’ since maybe your webhost accidentally changed the owner when restoring a backup or because they thought that was the right thing to do.