WordPress caught me on the hope a little bit by releasing a new version of their WordPress blogging software, and I decided to upgrade tonight. I had a couple of issues with the upgrade this time that are worth pointing out. Firstly, if you can’t login in again after the upgrade, clear your cache and your cookies, then try again. Don’t do what I did and spend ages trying to change the password in a variety of ways.
Also, if like me you use the K2 theme, you may then find your sidebars have reverted to the WordPress default. If you go into the K2 options, don’t change anything, then click save, this restored them to how they were before for me.