Auto dimming display/kb not working

I need some help tracking down where this setting is stored. Here is the situation...
I have 2 user accounts on a 2.4 Penryn MBP. When the computer is 1st booted the kb backlight is on and the display is dimmed to the same level regardless of the ambient light levels. When I log into MY account on this machine the levels remain and the light sensors are completely non-responsive even if I cover the speaker grills completely. I have both auto dimming check boxes selected in the display and keyboard system prefs.
Now, if I log into my wife's account on the same machine, everything works just as it did before. Auto-dimming of both the kb and display back to normal.
I have tried resetting the SMC, PRAM, trashing all prefs in my user folder, trashing prefs in the root library folder.
Where are these settings stored? Any ideas on how to reset them?

I really would like to know too where are stored the enable/disable auto-dimming display preferences.
This setting is not scriptable, not programmaticaly accessible (Obj-C), not even stored in any .plist, because I have logged filesystem events and nothing is written to the disk when this setting is changed.
It is really annoying ! I would like to access this setting by applescript for exemple. The only way to change it is by opening the System Preferences, then de Displays panel, then using the checkbox.
Does someone have any clue on this?

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