Cinema Display 20" kills some system preferences

My MacBookPro (Core Duo 2GHz) running OS X 10.4.8 is set to require password entry to exit screen saver or wake from sleep or display sleep. These preferences work fine until I connect to the Cinema Display and run in "clamshell" mode. Then the password requirement is bypassed. This is a recent development (sometime in the last two or three weeks, before which it all worked fine). Another symptom, possibly related, is that System Preferences runs very slowly, with considerable delay, requiring a lot of CPU activity. Any way to explore what might be going on or how to fix? (Permissions o.k., I checked and fixed.)

You may want to install WinACD <http://sourceforge.net/projects/winacd/>.
See if it lets you reduce the brightness. If not, use the brightness buttons on the display.

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