Actually I am having this problem too. I usually change the title of my first post to reflect any changes in sales, wtb, etc., then I edit within the body of the post, or add an additional reply. This used to change what someone would see from the commerce forum when they came across my thread. I was able to to this up until yesterday. Now no matter what i change the original Title to... when you look at my thread from the commerce forum the initial topic title wont change.