View Media:Content option empty

Hey, I can't seem to figure out why my images aren't appearing in the feed so I could do with some help. I'm using the imagefield and imagecache method to display the images in nodes. (which works fine).

I've setup a 'Feed View' with the 'Row style: Media RSS', have selected the content type, have choosen 'Display type: Full text plus pics' but the next two options for 'Media:Content' and 'Media:Thumbnail' are both empty. I'm assuming this is something to do with the way I have setup the imagefield?

In the content type options I just have the 'Title' field and the 'File' field.

In the 'Default' View Fields section I have selected the content type and both the fields but I am unsure of the following settings....

Label - Assuming this doesn't matter but I have selected 'None' anyway.
Format - I have the options for 'Generic Files' or 'cachepreset image' or 'cachepreset image linked to node' or 'cachepreset image linked to image' or 'cachepreset file path' or 'cachepreset URL'

I think I've tried all the format settings but every time I go back to the Feed View the 'Media:Content' and 'Media:Thumbnail' are both empty.

Any ideas? Let me know if you need specific details.

Thanks.

Andy.