10.6.5 forgets screen arrangement

Hi all,
Since the upgrade to 10.6.5, Snow Leopard forgets the screen arrangement for external screens. Before 10.6.5, it would remember the previous arrangements after reboots. Furthermore, it would remember this for different screens: e.g., my LCD at work was placed on top and my TV was placed on the right.
Is this a known bug for 10.6.5 or was this behavior deliberately changed? Either way, it is very unlucky since this was a really nice feature. Several other users have reported this "bug" to me as well.

I have quiet similar problem as described but it is on my macbooks screen. It blinks while I am working and sometimes blinks instead of dimming the display. It also flickers at 40% to 50% brightness while going dim, which camera won't capture.
I am sending you links to the two videos I was able to make, most of the time it won't blink when I video it.
http://www.youtube.com/watch?v=eRP0I4VgQZY
http://www.youtube.com/watch?v=b5gdqY0ONyA
Lucky to have some proof. But Apple guys still denying it to be a problem at this stage, I have got its display changed twice and logic board replaced. But the problem persists.
Help! me to understand and explain the issue.

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