The NVIDIA graphics update released earlier in the week has been unexplainably removed by Apple today.
When the update was released Apple stated that it would improve cursor movement when using the Apple Mini DisplayPort to Dual-Link DVI adapter with the Mini DisplayPort-enabled MacBook Air, MacBook and MacBook Pro.
It is unclear why the update has been removed and Apple's online discussion forums continue to fill with issues with flickering displays, and displays going black.