Put a breakpoint or NSLog in Provider's dealloc method; maybe it is never being called. I assume you're releasing arrProvider in your appdelegate's dealloc method? Or is that leaking too?
Also, if you click the gray arrow next to the address of your leaked NSPlaceholderString you can see that "history" of that memory address. Start at the bottom (most recent) and look up until you see malloc. That will be the history of every time that object was malloc'd, retained, and released. Somewhere in there is a retain without a release.
PS - I am able to create a similar leak in my own code if I modify ProviderID, LastName, or FirstName directly, without using "provider.blah = blah" or "self.blah = blah". Are you, in any location, changing the variable without using the property?
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Last edited by smasher; 07-03-2009 at 12:24 PM.
Reason: add PS
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