Help, I have a recurring problem with corrupted class files created by Xcode 3.2.4 and I don't know much about class files. I start having this problem whenever my application become large and I try to change the inheritance of some MacRuby files. Occasionally, the change will cause Interface Builder to crash immediately without an error message but usually the problem manifests itself by not updating the class inheritance information in IB. Even after selecting "Reload All Class Files", IB will show the old inheritance. Deleting my file from Xcode and adding it back in still does not fix the problem. The only way I know to fix the problem is to copy all of my source file into a new project but this is getting to be more than annoying. Is there a way that I can force Xcode to rebuild all class files for my project? Thanks, Bob Rice