Unable to attach link with Wall Post

This is driving me crazy and was wondering if anyone knew about this issue. Sometimes I am not able to attach a link from my website page to a wall post. So yesterday I added the following:

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="http://www.facebook.com/2008/fbml" xmlns:og="http://opengraphprotocol.org/schema/" lang="en">

<meta property="fb:page_id" content="{my fb page id}" />
<meta property="og:site_name" content="Example"/>
<meta property="og:title" content="Example: Example Title"/>
<meta property="og:image" content="http://i.example.com/img/image.jpg"/>

Now, when I attempt to attach the page, it displays, “Example:” and looks for the image and finally displays no image.

Also strange, when I attempt to attach the home page, which contains the latest image, it display an image from 2 days ago.

Yesterday when I tried before the og: additions, it found a 404, as if the new page url never existed.

The whole point I opened a facebook account is to post updates from my site so this is driving me crazy. Can anyone help me out here? Thanks.