I have 2 of these on a MAC mini v3, both with portrait rotation. Same problem, thank goodness for time machine to roll it back to 10.6.2. I opened a support call with Apple to confirm this as an issue and to allow them to go back to OSX development to make sure the changes they made in 10.6.3 are not to blame.
So I actually have 4 heads on this mini, and have been debating swapping the landscape displays driven off the MAC internal adapters with the portrait displays. This would/could solve the problem but I prefer the landscape displays as the main ones.
Any progress on a fix? Any word from Apple if they are taking responsibility?
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