I am having 2011 27" iMac in my core i7 and AMD Radeon HD 6970M 2GB with the outside displays. I think that most of the graphical issues are present in the outside displays but here in my case the menu bar, dock and volume popup all appeared distorted on the main display. I never had these issues with Snow Leopard but as far as I can tell its some kind of graphics driver issue, don't know how this wasn't spotted in the beta. recommend me to resolve this type of the Graphical issues with 2011 iMac and Lion.
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