I am using ATA 3.7.3 and wp 3.5.1

I have a number of images in the left sidebar of my home page which are links to other pages:
http://thaihealingmassage.com
This is the code which I am putting in a text widget:
<a href="http://thaihealingmassage.com/courses/video-course/" target="_blank">
<img src="http://www.thaihealingmassage.com/wp-content/uploads/2011/12/video-course-library.png"
alt="visit our video course library" width="175px" height="45px" /></a>
<p>

My code includes an ALT text and the image size, but when I run my site through this tool: http://www.feedthebot.com/tools/alt/ which checks for missing ALT text and missing image size, then neither the ALT text nor the image size shows up. It tells me that the ALT text is "Generated Image" (not correct), and that the image size is missing.

However when I place an image in the center section of the home page, then the ALT text and the image size shows up with no problem.

And here is the really weird thing: The same sidebar image links show up on all my post pages. When I run a post page through the ALT checker utility (try http://www.thaihealingmassage.com/12...e-get-massage/, both the ALT text and the image dimensions do show up for the "Visit our Video Course Library" image. This works for post pages, but nothing shows up on page pages. However it does not work for all the subsequent images, only for the one. Can't figure that one out!

What could be the reason that the code location in a text widget in the sidebar of my page pages strips out this information, but not in post pages?
Is there another way I could code this so that it does show up?

try disabling ALL plugins

I found the offending plugin. It was Hyper Cache Extended. I just installed this a few days ago after the latest update to W3 Total Cache crashed my site. I don't have too much luck with caching plugins, it seems. After I deactivated Hyper Cache Extended, all the missing code info shows up as it is supposed to.