On any cms you choose (my vote is for Joomla by the way, though the Wordpress community is gigantic), always wait a while to upgrade after each release, and definitely avoid "beta" updates. I always tell that to folks who aren't interested in being a hero or martyr for the cause of an "update". Some updates are meant to fix previous security issues, while creating new bugs in the process which can be equally as troublesome (where the site owner can inadvertently deface their own site).

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