ImageCache resize output to a View problem

Hello. I've a problem getting an image attached to a node to appear in it's resized form on my site's front page via a view.

How I've got things set up; I've added an ImageField (field_posterflyer) to my Event content type so users can upload a poster/flyer image for display in a view on a site's front page. I've an ImageCache resize preset added ("event_image") which should resize an image to have a width of 420px. I've also got both a) the ImageField (in the Event content type's 'Display fields') set to show the ImageCache preset and b) the view set to 'Content: Poster or flyer (field_posterflyer)'. (I wasn't sure if the former was required so I set it anyway.)

My problem is that the view isn't outputting any image when the format is set to 'event_image image', though strangely it gives a URLs that sound like they should be correct (http://theforest.org.uk/drupal-6.9/sites/default/files/imagecache/event_... and http://theforest.org.uk/drupal-6.9/sites/default/files/imagecache/event_...) when set the view to 'event_image url', but these both give a 404 (fyi; the server setup makes this give the current Joomla site error page).

I've had a google around but can't find any examples of others setting things up for this kind of usage. Can anyone advise on where I'm going wrong? Thanks.

p.s. oh, and;

Drupal 6.9
Content 6.x-2.x-dev
ImageField 6.x-3.0-alpha4
ImageCache 6.x-2.0-beta8
Views 6.x-2.3