Steve
Below is the way item(s) are being shown to me using Firefox and inspect element. Some parts are X out on purpose I think enough is left for this discussion.
<img id="product_thumbnail" src="http://www.xxxx.com/images/P/xxxxxxxx%xxxxx%20x%20750.jpg" width="238" height="238" alt=" description text" title="description text">
If I am reading your post correctly then we should not be getting this
error with the above code in place.
I am running this through Bing Webmaster SEO Analyzer and the report states:
The <img> tag does not have an ALT attribute defined.
Thank you for your time.
Frank