As you pointed out, Chrome updates flash automatically, so do check to make sure you have the latest version of Chrome. Click on the wrench in the upper right corner of the browser window and then "About Google Chrome". This will also start the update process, if you aren't using the latest version.
Regardless, the site linked to your username is using Skeptical. Could you give us the link to the blog having the problem, starting with http:// to make it clickable.
Is there any chance you have accidentally turned off commenting on your site or on the posts which do not show the comment form? See here: