Suspected bug with RAW to jpeg conversion

When clicking done on a RAW image (or double clicking it) in iphoto, why is it that sometimes it works and other times it doesn't?

It seems to work if you make changes to the image but if you merely want to turn it into a jpeg so that you can export it to something like flickr it doesn't seem to work.


This means when I drag my images to flickr export it only accepts jpegs so half my album is not publishable to the web - or viewable by anything outside of iphoto.

Any suggestions?