Check Bug Tracker Before Updating
There have been a handful of bugs in EE 2.2 reported today, so I encourage everyone to check the bug tracker first before upgrading.
Update: This bug has been fixed in the current download of EE 2.2.
As always, you should be only doing upgrades on your live sites after backing up and fully testing the upgrade in a separate environment (like localhost or a development server). I put together a video tutorial on upgrading ExpressionEngine, which walks you through all of the steps of upgrading to a build or a new version.
John Faulds — 00:57 on 06.23.2011
Looks like EL have put a hotfix for the one Brad Parscale found already: http://expressionengine.com/forums/viewthread/192216/#906842