I would have to assume that your post, before upgrade, was using a post icon not present in 2.1.
Check in your database, table smf_messages (replace "smf_" with your actual prefix) for the "icon" column. See if any of those is empty or null
Re: Missing message icon, bug?
Check in your database, table smf_messages (replace "smf_" with your actual prefix) for the "icon" column. See if any of those is empty or null
Re: Missing message icon, bug?
