People might delete their posts to be annoying, or delete things and then blame it on a moderator if they\'re pissed off. It\'s not a good idea, I think.
You can just edit your post and remove the text, and if one of us sees it we\'ll delete it for you.
And on the original topic: I\'ve never used this feature myself, but I\'ve not heard of people having problems with it before. Perhaps your browser settings are stopping the change from taking effect? *shrug*
What was your solution?