Since the upgrade, outsider comments are getting attached to a header image in the theme, rather than to the post they're commenting on.
None of the posts have featured images,BTW. And all comments seem to be attached to a single JPG file used as a header image (I have >100 header images that appear randomly, but only this one seems to have attachments).
How to I reset the comments so they get attached to the proper post, and how do I prevent this in future? I'm using Theme 2011 and WP 3.5.2.
Thanks