I just started getting weird errors in Xcode 3.2 with a project that was working fine. I compiled and tested my app and it ran fine; I made a couple minor changes and it compiled fine but throws and exception at runtime when I called a method. I commented out the changes so it was identical to the previous, working code, and it still throws the exception. It's gives me an error: I haven't moved or deleted any files. So I monkey around for a while (code looks good) and still no luck, and I finally try to run it on a second machine (a SL iMac also running Xcode 3.2) and it runs perfectly. So I uncomment the changes I made, and it still runs fine. So obviously somethings going on with my macBook, that's not happening on my iMac. I don't really have any experience with this kind of situation so I'm not sure where to go next. I guess I could try re-installing Xcode, but I was wondering what might be causing the problem and what I can do to prevent it in the future. Thanks for any help you can share.