Image upload broken when editing content
Make sure the file directory exists at sites/default/files and make sure it is writeable by the web server. For this you need to go to the file directory if you are familiar with terminal and type chmod -R 775 files when in the directory that contains the file directory. otherwise in an FTP client like Filezilla right click the file and click file permissions and change the permissions there.  You may also need to check that this folder files/imagecache/product exists and is writeable.