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    <h2>Final Edit:</h2> <p>I found the solution to my problem, maybe it will solve yours too. (Look at my answer to this question:) <a href="https://stackoverflow.com/questions/1575529">UIButton, created by Interface Builder, is crashing</a></p> <p>Specifically, if your buttons have any images, try deleting them from your project, getting fresh copies, renaming them, re-adding them to the project and then hooking them up again. Seems to have worked in my case.</p> <hr> <h2>Previous randomness from me:</h2> <p>(Not an answer, but...) For what it's worth, I'm getting a similar message. Maybe adding what I'm seeing might help figure this all out. I get this both in the Simulator and on the device.</p> <p><code>-[UIImage isKindOfClass:]: message sent to deallocated instance 0x1661f0</code></p> <p>This message is not always identical for me, sometimes its about retaining an invalid instance, or a few other similar sorts of things. None of these are things I'm doing myself, but behind the scenes stuff.</p> <h2>EDIT: Here's another one:</h2> <p><code>-[UIImage retain]: message sent to deallocated instance 0x3b621a0</code></p> <p>Here's the code where I'm getting dumped (like you, I'm showing a modal dialog, though mine's a custom UIView). In my case, I'm forcing the run loop to wait for a user response like this:</p> <pre><code>[modalDialog showInView:self.view title:@"Illegal Move" message:message cancelText:@"Cancel" proceedText:@"Cheat"]; while (waitingForDialogToDismiss == YES) { //this line is where NSZombies puts me: [[NSRunLoop currentRunLoop] runMode: NSDefaultRunLoopMode beforeDate: [NSDate dateWithTimeIntervalSinceNow:1.5]]; } </code></pre> <p>This modal dialog is built completely from a nib, and has a couple button images and shows correctly almost always. However, if I try to "rush it" by tapping many different UI elements before it comes up, I can get this error about 30-40% of the time. On one occasion, even though the dialog showed up, its Cancel button had the wrong graphic.</p> <p>It almost seems like the showing of the view isn't always completely loading everything correctly, or maybe in a timely manner.</p> <p>For the moment, I'm going to try rewriting a bunch of code to remove the NSRunLoop business. We'll see.</p> <h2>EDIT 2: No help</h2> <p>The NSRunLoop was definitely not the problem. I've narrowed it down much more and started a new question here: <a href="https://stackoverflow.com/questions/1575529">UIButton, created by Interface Builder, is crashing</a></p>
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