I have the mysterious blue borders, too – only on images in posts, and regardless of if they’re linked to anything or not. They’re ugly and driving me nuts.
I’ve tried borders of 0, none, and 0px in the css file everywhere I can find. I’ve tried manually putting it in the code for the image. I’ve tried viewing the site in Firefox and Safari. I’ve tried three different themes, including the default. I’ve tried an upgrade to 2.3.3. It’s still there.
Heeeeeeeelp.
(link)
UPDATE: If I apply a class to the image (I tried class=”centered”), the blue border disappears. But I don’t want to go back and do that manually to every image I have in a post. There must be something else I can do?