Crashing at launch. Reinstalling XCode failed Erasing plists failed Shift open failed Deleting CoreSimulation.framework failed Some kind of work around found : Use Command+SpaceBar Search for a web site and open it directly from the popup search results Still crashes if the address bar is clicked Can't open preference pane (menu or keyboard shortcut) Getting either one of these errors Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXCBADINSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Exception Note: EXCCORPSENOTIFY Termination Signal: Illegal instruction: 4 Termination Reason: Namespace SIGNAL, Code 0x4 Terminating Process: exc handler [5452] Application Specific Information: Crashing on exception: The window has been marked as needing another Layout Window pass, but it has already had more Layout Window passes than there are views in the window. Or Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXCCRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXCCORPSE_NOTIFY Application Specific Information:** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: image != nil' terminating with uncaught exception of type NSException abort() called Sorry @alexrogan (but thanks) this thread ain't over ;) Really looks like an Apple issue.