NoahK
Hottie Mod
Theres a thread over on the Apple forums about FCP X freezing up regularly on the iMacs with the 680MX. Link below, but the gist of the 24 pages is that FCPX doesn't react well to rendering titles, forcing restarts and the like.
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Looks like OS 10.8.3 update that was recently released at least fixes the freezing on the 2GB iMac systems.
-Noah