Lion, Filevault, Security, Require password immediately after screensaver is forced - any workaround?
Upgrade to Mac OS X 10.7.2 or higher for the Security and Privacy setting "Require password time period after sleep or screen saver begins" to be respected after FileVault is enabled (though I don't see anything about this fix on the download page).  There is no longer a need to keep System Preferences open forever (what a silly but effective fix) or any of the other workarounds.