When I edit one of my posts, it occasionally does not show the correction, however, it does show that the post has been edited. I've tried it in IE
and Mozilla.
Breifly, if you edit, then preview, whats' previewed is the edit, but the composition window reverts to the original. Then when you hit the 'edit'
button to post it, the system recognizes that there was an edit, and puts in the tag, but because the composition reverted, its lost.