How to assign ImageCache setting to an imagefield in content type
in order to work, imagecache relies on a tmp folder that needs to sit on your server. While developing local the tmp directory is located under the local webserver directory obviuosly and that needs to be changed when you go online. Administer » Site configuration - then file system is where you change it do a directory that is compatible with a server on your host. Setting the permissions to 777 then allowed imagecache to store the necessary image files and solved my issue.