Animations during pushing view controllers to nav. controller sometimes stop working?

Whenever you use ...animated:YES/NO the Cocoa framework will determine if it can/can not do it and more often than not it just fails. Like Michael said, you might not be on the main thread or who knows what. If you look at the latest Lion API's for fullscreen animation on an NSWindow you will find various delegates for the animation failing providing details.

So I wouldn't expect Apple to go back with an animator and add such functionality.

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