Soon after upgrading to Lightroom 1.4.1 I noticed I couldn't export directly to my flickr account anymore. Did lightroom change their plugin structure with 1.4? Well after a little digging on the web I found the problem, seems when I was playing with to original SDK files from Adobe with version 1.3 I put the plugin 'MODULES' directory in \program files\Adobe\Lightroom 1.3 where it was soon abandoned when I upgraded to 1.4 (due to the directory name change)
Moving the directory to \Documents and Settings\user\Application Data\Adobe\Lightroom\ allowed the new version to find just fine on restart. And now everything is right again in my Lightroom world.