Xcode 4 project: utility to clean up pbxproj file?

Question

I have an Xcode 4 project with 2 targets, one for iPhone and one for iPad. If I click on the iPad target and try to go to Build Settings Xcode 4 crashes:

Answer 1

Right click your .xcodeproj file and "Show Package Contents".

Then open project.pbxproj file with TextEdit and duplicate.

Save duplicate file anywhere with same name and extension. (project.pbxproj)

And replace with the old file.