Re: Problem with updating NSProgressIndicator

[Jens Alfke]

That's a very strange problem. Ordinarily, even if the main thread were hung, the progress bar would still show its animation (that's done on the "UI heartbeat thread".) And the way it updates when you click implies something's messed up with window-redraw behavior.

—Jens

My first guess is that your code is calling AppKit unsafely from a background thread. But it sounds like your other thread only does calculations. Any other threads that might be making AppKit calls? Second guess: something throwing an exception for some reason. Check the console output for any exception logs. Set a symbolic breakpoint at objc_exception_throw (on 10.5) or NSRaiseError (10.4) and see if it gets hit.

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