Uploaded images not showing in admin panel

I’ve search the forums (and web) with no solution to this issue. The few suggested workarounds seemed to address slightly different problems and didn’t work in my case.

I can upload image files just fine and have confirmed that thumbnails are being created correctly. However, the admin page for creating a new post (from which images were uploaded) does not show the image thumbnail or give the option of inserting the image into the post editor. All I see is a blank blue square with the image title. (screen capture) When I click on the blue square, I’m presented with the option of inserting the link into the editor. (screen capture). The page source shows (for the first image in this example):

<div class='upload-file-data'>

        <input type='hidden' name='attachment-url-560' id='attachment-url-560' value='/wp-content/uploads/2008/01/012308_21291.jpg' />
        <input type='hidden' name='attachment-url-base-560' id='attachment-url-base-560' value='http://weblog.javazen.com' />

        <input type='hidden' name='attachment-is-image-560' id='attachment-is-image-560' value='0' />
        <input type='hidden' name='attachment-page-url-560' id='attachment-page-url-560' value='http://weblog.javazen.com/?attachment_id=560' />
        <input type='hidden' name='attachment-title-560' id='attachment-title-560' value='Fire 4' />
        <input type='hidden' name='attachment-description-560' id='attachment-description-560' value='' />

</div>

This issue appeared after two significant server events: 1) the blog site was moved to a different server with a different physical directory for the wordpress installation and 2) wordpress was upgraded to 2.3.0. Subsequent upgrade to 2.3.2 has not resolved the issue.

If the issue was related to a different physical drive directory structure, I would expect old image links to thumbnails to fail, but uploaded image links to thumbnails for post server/wordpress upgrades to function properly.

I’ve tried all I can think of to resolve this and would welcome any suggestions.

Many thanks…