This week I decided that now ImageField was available for Drupal 6 I would move from Image Attach to ImageField. This all went fine and works well, but ImageCache does not work very well with Lighttpd web server.
ImageCache is module that crops and resizes ImageField images, these are then saved within in the files directory. The module makes use of Drupal's CleanURLs system and Apache's Mod_rewrite function. Apache is a widely used web server but because of my lack of RAM I have chosen to use Lighttpd. Lighttpd doesn't work in the same way as Apache so ImageCache ends up getting confused.
The other problem I am having is when an image file is uploaded via ImageField the permissions are not set high enough to allow it to be displayed.