I also had problems with my plugins, so I attempted to downgrade from 3.3 to 3.2.1.
After exactly following LMP’s instructions, I got a message saying “Database Update Required: WordPress has been updated! Before we send you on your way, we have to update your database to the newest version”, just as LMP said would happen.
But the problem comes after i click the <Update WordPress Database> button, and click the <Continue> button at the “Update Complete” page. When I click “Continue”, the page goes back to the “Database Update Required:…” page, and the loop goes over and over.
If anybody knows how to solve this sort of problem, please let me know.
Seriously never updating again, either.