Question: I downloaded Xcode SDK 3.2.2 from Apple’s web site to develop some iPad applications but I had to upgrade from Mac OS X 10.4 to Snow Leopard first. I downloaded and installed all OS X updates. Current version is 10.6.4. It took two hours but works fine. When I wanted to install Xcode 3.2 my Mac crashed. It keeps crashing or hanging all the time I try to reinstall the SDK. What is going on with Snow Leopard and Xcode 3.2.2? Please do not say clean install… This could very well be an Apple problem. Answer: The symptoms are not affecting everyone. We are sure that Apple tested Xcode 3.2.2 and Snow Leopard on its computers. Programmers with problems and other programmers without problems are using the same Macs and OS X. Actually our MacBook Pro works perfectly while running Xcode 3.2.2 on an upgraded version of Snow Leopard. There’s something else going on. As you try to avoid clean install you have to ask yourself: what is the problem with my Mac? What is different? The very first answer is the disk system. You definiately have your own unique folders and files, and traces of what you have done with it. Obviously, these solutions are not this way work for everyone, but worth trying them: 1. Verify and repair disk permissions – Use Disk Utilty. 2. Re-write all the permissions from scratch – boot into safe mode. How-to: while rebooting your Mac hold down the Shift key until it shows the Apple symbol in the middle and a progress bar. – you are now in safe mode. Test your file system. You probably do not need to do anything. – reboot in normal mode. This process rewrites all the disk (folder, files) permissions from scratch. 3. Remove shared, corrupted or incompatible files from your Mac – Disable File Sharing. Use System Preferences -> Internet & Wireless -> Sharing utility. – Remove files from Shared folders. Remove any additional files from your user’s folders you may consider needless. – Turn File Sharing on. – Reboot One of the above solutions will likely save you some extra hours. Do not forget to backup your valuable data before doing anything on your Mac.