I'm not even sure if this is an Xcode (well, Interface Builder, really) bug or something in our code, but one of our images titled "menu.png" was showing up weird in Interface Builder. When you run it in the iPhone simulator, everything looks fine, but whenever we opened up our HighScoresView.xib, it would show some weird menu image instead of menu.png, and in the attributes it would show "menu" (without the file extension). This would go away once we added the ".png" but if you save and reload, the same thing would happen. Upon inspection of the xib file, it would appear the file is saving correctly:
<string key="NSResourceName">menu.png</string>
but I guess Interface Builder opens it up wrong. Although this doesn't affect our end product in anyway, we ended up just renaming the file menuu.png and this problem went away. Strange!