Unfortunately, the whole version checking thing has to be on a per character basis because of the way the saved variables file works. That message is the product of having actually updated your saved variables from one version to the next and it is on a per character basis.
I've got 25 toons myself, so yeah... I understand. But until I can come up with a way to update all of the toons saved variables at one time -- which is not a trivial undertaking -- it's kinda stuck that way.
