Xcode 5 from the App Store crashes when I select any file in the Project Navigator or when I try to edit it. I have deleted all plugins and the derived data for the app and
I faced this problem for the first time while using Xcode 6.1.
I had just cloned the project and it was crashing as soon as the Indexing process would start. I disabled source control as suggested in the previous answer and it was still crashing.
In my case, the problem was that the Destination was a device that was connected to my MAC at that time but was not included in any of the Provisioning Profiles that I had installed on my MAC. Changing the Destination to any of the simulators before the Indexing process would start fixed the problem for me.