First, I'd like to apologize to all of you who've read this thread and wondered what happened to it. I was tied up on another project and just got back to this one today.
Second, it seems that the solution given in the original post may have worked when it was posted. The code for the Templates has changed since then, and my lack of scripting knowledge led to my dilemma. Seems the answer was staring me in the face. To overcome the mess shown above when adding html to you Comments, track down the section of the code that adds the Comment to various image attributes, and remove them (all!). In my case, I removed one adding it to the image Title, but missed the one for the Alt tag.
It may vary from template to template (I'm using Lightbox), but look for it under the {* Photo List *} section.
Look for this:
<img src="{$onepicture->thumbnail}" alt="{$onepicture->name} - {$onepicture->comment}" title="{$onepicture->name} - {$onepicture->comment}" />
And replace it with this:
<img src="{$onepicture->thumbnail}" alt="{$onepicture->name}" title="{$onepicture->name}" />
And don't forget to look for variations such as:
{$onepicture->name|escape:'html'} - {$onepicture->comment|escape:'html'}
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