I'm in the process of rewriting all code on my site (all secure https pages) so no warnings will show in FF or Chrome. All pages work, except for my comments page. At first I thought the culprit was the avatar image hosted by http://www.gravatar.com, but even after I changed it and hosted the image securely on my site, I still get mixed content pointing to www.gravatar.com. I did not find a place where I could change/edit that. Any ideas would be very much appreciated.
However, I had done a full search for "http://www.gravatar.com" before posting here and it was not found in any of the php files. There are references to http://www.facebook.com etc., but there is no gravatar anywhere. Just double-checked again.
Sorry for my late reply, but server went down last couple of days...
You're right, it's version 2.5.
I found the reference to http://www.gravatar.com in the comments.php and changed that, but I double-checked the head.php file again, and still cannot find anything named gravatar.com in there... I have attached the head.php file here.