Upgrading to MT4

After several weeks of testing, I’ve decided to upgrade this blog to the latest version of Movable Type. Knowing my recklessness, weird things may happen.
I suspect some plugins may not work after the upgrade, like S-code (captcha code you have to type in before posting a comment). Please bear with me…
[Update: Confirmed that I have to remove that plugin… until then, commenting may not work.]