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The resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.
According to the freetools checker, the server responds with:
shouldn't that be an image type and not a text type?
GET /images/large/DII-Towel-ET-emb-700sqgmp_LRG.jpeg HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0
Accept-Encoding: gzip, deflate
HTTP/1.1 406 Not Acceptable
Date: Sat, 21 Sep 2013 17:36:28 GMT
Keep-Alive: timeout=5, max=99
Also, have you tried uploading the image to the root directory of your site with a different name like testing.jpeg to see if it's a URL issue?
Downloaded the image. Renders fine locally in browser. Uploaded it back to the root. Renamed it 'atest.jpg'. Renders fine in browser via HTTP. Changed the extension to '.jpeg'. Renders fine in browser via HTTP. Uploaded it to /images/large/. Renders fine in browser with either .jpg or .jpeg.
The only thing that makes these files different is that they were created by the shopping cart admin via user uploads.
[edited by: JD_Toims at 8:56 pm (utc) on Sep 21, 2013]
I'd been entering the URL directly in the browser.