Well, I read somewhere that they had solved it, but there is a problem: you should get a new version of Mint in order to see the updated "MintUpdate". The problem is I'm not sure how to download that single package. I did it before they changed the Software Portal, when it was pretty simple, but now they seem not to give you that option. Nevertheless, I have two ideas, but be warned: I have not tried any of this, so you're on your own, also, remember that installing packages manually could damage your system, so you're doing this under your own risk (although I have not had any problems so far). Now, my ideas are: (1) Find the package either on Mint's web site or on some other place, like mirrors, or (2) Uninstall package "mintupdate" through Synaptic or whatever package manager you have and then use the Software Portal, where you should search for that same package and click "Install".
One important thing is that you should first try to install that latest version through the Software Portal without
uninstalling MintUpdate. In my case, i tried but it said "mintupdate is already installed", even though the version I have is older than the latest version.
I would recommend you to start with idea number one (1), since I believe is more secure. Be sure to download at least version 4.3.2, which is newer than the version on Mint 9. That is not the latest, but at least it shows the changelog. However, if it doesn't show up, Go to Edit > Software Sources, and, on tab "Linux Mint" tick "Source Code", so it is enabled. Maybe there are some packages that won't show the changelog, but there are just a few. Until now I think it has only been one package.
Hope this helps. Good luck!