About the screenshots, i just think you use a bad link of the image :
there is two link "link" and "direct link"
if you use the "link" one the image won't show up so you must use the "direct link" one (but you must create an account to use this link)
So (if you don't want create an account) when the pictures is uploaded, click left on your picture, then click right on your picture (wait the next page is loaded) and select "information about the picture" and use the select link and the picture will show up
exemple :
(link) http://imageshack.us/photo/my-images/38/yanj.jpg/ ==> (no picture)
(direct link or if you use what i said) http://img38.imageshack.us/img38/7612/yanj.jpg ==> [IMG]
PS: it works if you use this site : http://imageshack.us/ (i don't know if it works for other ones