Yesterday I've installed the iPhone SDK, which includes the Xcode 3.1 beta, on my iMac. As I've understood, it can't be installed on my PowerBook since it doesn't have an Intel processor. Now I have a problem: I've edited a project on the iMac, and ever since I can't load it on my PowerBook. The error is 'Project [...].xcodeproj cannot be opened because the user file cannot be parsed'. Using xcodebuild from the command line also yields a list of errors. So, any way around this, so I can still use my projects on my PowerPC Mac?