I was trying to upload a couple of photos of my KMX Cobra - the final submit button kept coming back as 'broken link'. Now there is 7 copies of the same two photographs....
i am far from an expert on this but you can try; click on "edit post" then "go advanced" then "manage attachments" and that should do it..you can even delete the whole post and start again i believe
If you try again to upload a photo, you'll see the previous photos in the "Add Image" box on the upload from computer tab. Below there's a button named "Clear List", that wipes them from view and I think it might do what you want.