Bottomline: that seductive looking “Upgrade” button in the WordPress dashboard that makes you think you can get away with just clicking it — and lulls you into a false sense of security by saying the upgrade was successful — do NOT click it unless you’ve done all the tasks in the WordPress Codex instructions for upgrading first — especially the back-ups, and, ahem, then regarding reports of a successful installation, trust but verify.
Bonus tip: if you have set your Web host to back up your SQL database and blog files automatically, make sure it’s actually done that and then copy a few days of back-ups to your hard drive (both your files AND your SQL database). And another bonus tip: it doesn’t hurt to make sure your theme is compatible with WordPress 3.0 BEFORE you upgrade — or so I’ve heard.
I’m not sure if I got caught in WordPress permissions hell, or what, but my blog would not let me post, approve comments, or change any settings. However, after a couple of hours on the phone with a very patient and resourceful young lady in my Web host’s tech support department this afternoon, who then bumped my case up a level, I find tonight that I can post, and God willing, have full control of my blog again. I am so grateful!
My dear gentle readers, I missed you.