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Same here: "This copy of Parallels Desktop cannot be registered because it was activated with an invalid product key. Please contact the Parallels...
Also see thread "Leopard 10.5.3". :) My own experience: MacBook Pro (2.33 Ghz Intel Core 2 Duo, 2 GB), running Parallels Desktop build 5582,...
Also see thread "Display problems with Leopard update 10.5.3". :)