This is not an Atahualpa problem - I changed to the default 2010 theme and it still does the same (works in FF and Safari, but not IE8). I also tried deactivating all plugins except WordPress Connect - no change.
I looked at another website page that has a different Facebook Comments plugin (not for WordPress), and which works for IE8, and can see that in the opening HTML tag they have references to Facebook XML schema files:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://developers.facebook.com/schema/">
If anyone has any other ideas I'd appreciate suggestions.
By the way, my site URL changed, and is now http://www.actemplate.com. If you go to any of the pages in FF or Safari, you'll see the Facebook Comments at the bottom of the page, and it also appears after every post. Since I just installed the plugin yesterday, the only page that has actual comments at this point is a tutorial video that I posted a couple of days ago - since I sent emails out to our list telling them to check out the new video:
You'll see that there are about 15 comments already! This is amazingly cool. But of course, if it doesn't work for IE8, then that's not good...
I posted a question on the developer's site, but he doesn't answer questions very much at all. The plugin was last updated in June, and his last response to a question was in July. So I don't expect to hear anything there.
Anyway, if you have any ideas or suggestions, I'd greatly appreciate your help.